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Carburetion

1. sphere Adding a turbocharger merely serves to increase the inlet pressure For example 6 PSI boost equates to 14 7 PSI plus 6 PSI or a combined inlet pressure of 20 7 PSI or 140 of one atmosphere at sea level Here is how this works starting with the above formula l One atmosphere equals 14 7 PSI Il 6 PSI boost equals 40 of one atmosphere III Thus you must multiply the normal CFM by 1 40 to establish the requirement for six pounds of boost pressure Example 351 CID x 4000 RPM 1404 000 CIM 1 404 000 1728 812 5 CFM 2 stroke 812 5 2 406 25 CFM 4 stroke 406 25 x 1 4 568 75 CFM at 6 PSI boost In selecting the correct carburetor or mixer from the listing bear in mind whether the conversion is to be straight propane or dual fuel propane and gasoline All models listed are available for straight fuel or dual fuel applications Vehicle Engine Applications Wide Open Throttle 1 4 Manifold Depression Related i Cubic Cubic Model Horse L umin Feet hr Povver 5 460 6 480 10 10 200 12 12 120 17 0 2 12 360 c o nud D k D O 19 740 2 205 HP 300A 1 300A 20 217 HP 300A 50 300A 70 270 HP 20 880 25 920 27 600 360 GAS EQUIPMENT COMPAN Y Inc Two Stage Converter Impco Model J Series 100H P LP Gas EIE BN EE Screen atmosphere vent Model J only S1 59 Screw 8 32 x 5 8 SEMS 6 3 AC1 34 Cover assy secondary C1 34 P1
2. 1 nm ues Screw Torx Tamp Res M5 x 16mm New Sen 25 NEW DC cusam 2 NSS Pin Secondary Pivot 1 24 N P Lever Assy Secondary 1 2 Current SL A M 22 Lever Assy Secondary New 34 i ZZ LZ ANGGANG EN 31 Orifice Secondary Regulator Current 4 m u n Screw Adjustment 1 SE i eA s i y Screw Adjustment New 5 c 4 P 7 Watt 22 NS Deed 7 W ep m Plug Relief 1 2 Current QA MM SS d 23 Plug Freeze 50 Dis x 38 New AULA T WWE e NSS Ma er e m Screw Pan HD 10 32 UNF 2A x 25 L 1 E D d Screw Torx Tamp Res M5 x 16mm New 6 N dei RER RER RE EE SEI LING NSS Label Warning 1 2 9 m E ZB E 7 17 a RS yc 7716 NSS 10 AENA ss MH 11 3 NSS Screw FIL HD 1 4 28 UNF 2A 1 Current 15 ci NSS 12 14 20 NSS Not Sold Serviced Separately CURRENT 13 Repair Kit 1 T60 RBK 2 T60 RK GAS EQUIPMENT COMPANY Inc Carburetors Impco Model KN Regulator Components Options amp Accessories Gy Us Bees Im NSS Spring 4 Oz Model EN Red 039 00 12 Spring 4 Oz Model KN Red Spring 6 Oz Model KN Green 039 00 13 Spring 4 Oz Model KN Green Pin Primer Mod KN NSS Spring Primer 38 O D 19 1 D 02 NSS NSS NSS NSS NSS NSS ta NSS H Poe a Wes 3 NSS i4 NSS i5 0890032 i5 NSS Included in Repair Kit 039 99 c o nud D pum D O 366 GAS EQUIPMENT COMPANY Inc
3. complete w diaphragm S1 12 6 P2 1 D1 1 1 G1 15 R1 2 V1 10 L1 3 B3 24 CA300A only AV1 10 2 Air valve assy complete w silicone diaphragm S1 12 6 P2 1 D1 1 2 G1 15 R1 2 V1 10 L1 3 B3 24 CA300A amp CA300A 50 R1 3 Ring diaphragm support CA300A only R1 40 Ring diaphragm support CA300A 50 only S1 5 Screw 1 4 20 x 5 8 hex head SEMS 3 Screw 10 24 x 1 2 SEMS 3 C2 1 Clamp Boden wire S1 8 Screw 10 32 x 58 SEMS 3 AB1 2 Base assy complete L1 2 B1 2 S2 1 3 P1 1 3 CA300A only ms Base assy complete L1 2 B1 2 S2 1 3 P1 1 3 CA300A 50 only N15 Nut square 1 4 20 7 S1 69 Screw 1 4 x 5 16 plug 7C2 2 Cam assembly C2 2 W1 2 S1 7 Pd n Indicates components of minor repair kit 38 Indicates components of major repair kit Repair Kits RK300MI 1 20 2 SAN A Minor repair kit RK300MI 50 70 2 RKSO0MA 1202 regar EE RK300MA 50 70 2 JOr rep GAS EQUIPMENT COMPANY Inc 379 Carburetors Lean Idle Condition amp Vehicle Electrical System c o nud pum D O Model 425 Series Standard Carburetors for Natural amp LP Gas A B C Center to Mixer Center Bolt Air Horn Standard Throttle Carburetor Body 1 Reference diagram pg 3 2 Indicates silicon diaphragm Spacing in Diameter 3 2V applications require additional adapter between throttle body and CA4
4. Carburetors Impco Model IMP Series Regulators for Natural amp LP Gas The IMPCO IMP Series of Regulators are low pressure dry gas regulators intended for use with propane or natural gas Typical applications include all types of stationary gas fired appliances and equipment utilizing a low pressure gas supply The IMP Series regulators feature a unique concical valve design which permits low resistance straight through flow This design provides high flow at low pressures and enable the reg ulator to handle large capacity appliances with limited supply pressure Inlet Operating Pressure Outlet HP kW Temperature Pressure Max Range Fuel Mounting Filtration Postition Applications 100 hp V Se LE Stat d apor Or o0 wc a toe wc 350hp 40 F to 250 F 40 micron Vertical eii M Natural Industrial Gas 550 hp 850 hp O O e ai r 5 GAS EQUIPMENT COMPANY Inc Carburetors Impco Model CA55 Standard Series Carburetors for Natural amp LP Gas Impco s CA55 Series carburetors are offered in four design vari ations providing proven effective solutions for optimum metering and delivery of either alternative fuel or in dualfuel configura tions gasoline in engines up 75 horsepower The standard model shown beginning on this page can be mounted in either an updraft or downdraft orientation feeding either LPG or natural gas to engines from 1 5 to 70 horsepower The maximu
5. and 7 4L Mounts IMPCO CA 425 on gasoline throttle body Allows use of original air cleaner Pana Description Allows installation of IMPCO A9 31 2 CA 300A on GM fuel injection throttle body For straight LPG NG applications Comes with gasket Description Allows the use of the OHG X 450 on any gasoline carburetor with 5 1 8 air horn when combined with Glenn adapters A9 20 A9 21 or A9 22 Steel Description Mounts IMPCO CA 425 on 2 gasoline throttle body with original air cleaner Fits 1990 GMC 366 and 427 c i d fuel injection A9 3 uoneinqiey Pana Description Nylon plastic air shroud connects the dual hose OEM air induction system to an X 450 or CA 425 mixer Part Description A9 30 Mounts IMPCO CA 425 on TB9 1 Screws and gasket included GAS EQUIPMENT COMPANY Inc 39 Carburetion Gann Adapters Gann Adapters Pana Description Mounts IMPCO CA 225 on Ford 3 0L EFI engines 45 degree adapter mounts mixer on mass air flow sendor in horizontal position Mounting screws included Hecommended air filter F9 4 ei Beate Allows in line mounting of CA 425 mixer on Ford V 8 EFI engines Two 2 1 4 diameter hose inlets A9 36 adapter only AA9 36 adapter w gasket and screws Carburetion 392 Part Description Mounts IMPCO CA 225 on Ford 4 0L EFI engines 45 degree adapter mounts mixer on mass air flow sendor in horizontal position Mounting screws i
6. 10 S2 21 W1 27 S7 4 W1 27 Washer hand primer AD1 26 Diaphragm assy secondary hydrin 5 D1 26 P2 28 P2 27 R2 4 2 AD1 27 Diaphragm assy secondary hydrin D1 27 P2 28 P2 27 R2 4 2 6 S1 42 Screw 8 32 x 398 SEMS L1 37 Lever secondary regulator Pin secondary fulcrum 9 S4 27 Seat secondary regulator new Spring blue secondary standard Spring orange secondary optional 1 Screw 1 4 20 x 58 SEMS 2 Plug 1 8 pipe hex head Diaphragm assy primary DE HS NOTES Indicates repair kit components Two vapor outlet pressures are available Orange secondary spring gives neg ative Yo water column Blue secondary spring gives negative 1 Yo water col umn To change any JB converter to JO change blue secondary spring to orange Not shown Repair Kits Part Description a AK J 2 Slicone O O ei et O GAS EQUIPMENT COMPANY Inc 36 Carburetors Impco Model COBRA Series 325 H P LP Gas Ref Part Description 1 NSS Screen atmospheric vent Screw 8 32 x 7 8 Tork style 6 Cover Assy secondary AD1 27 5 Diaphragm Ass secondary flourosilicone Screw 8 32 x 1 2 Tork style SE Pin a fulcrum S4 27 Seal secondary S2 35 Spring blue secondary 0 37 kPa standard S2 38 Spring orange secondary 0 12 kPa optional El NES Body assy with jet eee Plug vapor outlet S
7. 21 31337 bo 35 Throttle stop lever 5 16 i d Throttle stop lever 38 i d Screw 1 4 20 x 5 8 hex head SEMS 3 Screw 10 24 x 1 2 SEMS 3 Spring stop screw Stop screw 10 32 x 3 4 Pin screw throttle stop Screw 12 24 x 58 Screw 10 24 x 58 NO U e S92 S93 22 F25 EON S112 B2 12 B2 13 UJ i NI 2 19 fon 3 N N N N N N N a a a eck Throttle lever O O ei ct el Gasket 1 1 2 flange Gasket 1 34 flange Gasket 2 flange GAS EQUIPMENT COMPANY Inc 377 Impco Model 300A Series Natural amp LP Gas for Dual Fuel Standard Mixers Standard Mounting Carburetor Surface to Top of Fuel Inlet CA300A M 2 CA300A 1 CA300A 1 2 CA300A 20M CA300A 20M 2 CA300A 21 CA300A 21 2 CA300A 22 CA300A 22 2 CA300AM 50 2 CA300AM 51 2 CA300A 52 2 CA300AM 70 2 CA300A 71 2 CA300A 72 2 FB300AM 2 FB300AM 50 2 c o nud gt D pum O 3 8 Fuel Inlet d XX X X KK KK KK X X X X X XX XXXXX NG d LARA AA ROKK RAR MU MC AAD A lt gt Adaptor Mounting Surface Complete mixer with 14 air filter Complete mixer without air filter Complete mixer with 10 air filter GAS EQUIPMENT COMPANY Inc Carburetors Impco Model 300A Series 1 amp 50 Ref Part Description Screw 10 24 x 58 SEMS 3 Plug idle adjustment Elbow w
8. 425 Series 2V Ret Pate Deseripten Spring air valve 91 22 Screw 6 32 x 1 4 SEMS 4 P2 22 D1 18 Diaphragm air valve D1 25 Diaphragm air valve silicone G1 102 Gasket air valve BV1 16 Air gas valve V1 16 V2 19 54 14 10 AM1 16 Air gas valve assy with diaphragm refer to chart for correct air gas valve assembly Body assy B1 27 2 C1 29 J1 9 81 50 S2 16 W1 33 S3 27 V2 18 P3 3 3 81 69 3 J1 5 12 951 69 Screw 1 4 28 x 5 16 4 13 P3 3 Plug 1 8 pipe 3 14 84 13 Seat idle screw Idle diaphragm assy 15 ADT 29 1 01 28 1 116 L1 30 2 23 R2 4 2 S4 13 16 G1 116 Gasket idle diaphragm 17 92 24 Spring idle valve 1 11 AB1 27 952 89 Spring idle adjustment C1 31 Cover idle valve S1 40 Screw 10 24 x 38 SEMS 4 S151 GT74 ASAT Sr SE 8124 PTS Pas SS S1 19 SE F2 10 S5 4 Throttle shaft 7 16 diameter B2 14 Bearing Oilite 716 i d 2 B2 9 Bearing needle optional 7 16 i d 2 953 12 Seal 7 16 shaft 2 S3 19 Seal internal optional 7 16 i d 2 H1 1 Ring seal retainer 2 Throttle stop assy 7 16 i d L1 11 1 82 15 S1 21 81 18 Throttle stop lever 7 16 i d Spring stop screw 81 21 Stop crew 10 32 x 34 951 8 Pin screw throttle stop AL1 12 3 Throttle lever long with screw L1 12 3 S1 32 1 C2 BIBI Bj T BJ O co GC G O DW O CO GOO NI NI NI NI IO NI INI NIN I NI lt j on o O1 eA Go PO O
9. 6655YN Universal water Y 3 4 x 58 nylon 6655YN 7 O O e ai r 5 38 72 1 16 1 2 1 1 4 3 4 1 1 2 1 116 2 Hose Clamps Worm gear clamps GAS EQUIPMENT COMPANY Inc 397 Carburetion Miscellaneous Fittings Vapor Hose Vacuum Hose Neoprene lined oil and heat resistant coil wire support permits free flow regardless of degree of bend This is a non porous Part Ip 4 vapor hose for LP gas and natural gas CVHOS8 59 Vacuum Y CVH 100 CVH 114 1 1 4 NOTE CVH 100 available in 25ft or 50 ft coils 60 3015 V4 x V4 x 316 Bulkhead Fittings Parts Descipion Water Heater Hose Single braid of nylon reinforcement oil and grease resistant T443 V4 NPT 2 ways x 38 flare Zones 58 STF 33 Straight bulkhead fitting 3 8 flare x 3 8 flare PV 3866 Bulkhead tee w relief selpac spi T444 PV 3866 Stainless Steel Wire Braid Hose and Fittings Developed for applications wherever a strong corrosion resistant LPGas hose is desired The special low extract tube handles propane or butane in liquid and gas form WARNING For LP and Natural Gas use only Do not use in anhydrous ammonia or refrigeration applications Do NOT use male swivel couplings or any type of couplings that use O Ring sealing surfaces U L 21 Dayco Series 7243 w cloth cover Part Number SS25UL 4 13 32 SS25U
10. IMPCO model E Includes strap brace gt Not shown similiar to GB88 but with cut out for o GB88 SP O GB89 Eight position bracket mounts IMPCO J Vff 30 on GB87 GB88 brackets or separately GBI Pivot point to permit upright position on fender shield GB95 GB80 GB86 D GAS EQUIPMENT COMPANY Inc Carburetion Miscellaneous Remote Fill Receptacle and Accessories Description Remote fill receptacle Double check filler valve 3 4 FNPT SS25UL 10 Wire braid hose 1 2 ID SS25UL 4 Wire braid hose 1 4 ID 6FS 10 Female hose swivel 5 8 6FS 4 Female hose swivel 1 4 E1 4B 1 4 x 14 x Male elbow E1 10D 5 8 x 1 2 x Male elbow U1 10E 5 8 x 3 4 x Male half union U1 4B 1 4 x 1 4 x Male half union Vent Valve 1 4 NPT w warn ing plate 1 4 MNPT x 14 x FNPT brass fitting with 54 orifice 2700 R BSS 7647SC 3165CP PL 631 54 Note Actual components may vary depending upon tank model and vehicle appli cation Please call our sales department for assistance Pressure Relief Vents Pop up relief vent assembly consists of nipple assembly lock nut rubber gaskets spring and hex nut Easily installed on a flat surface of auto body above trunk Description 2995 P Pop up relief valve assembly Vertical O O ei et O GAS EQUIPMENT COMPANY Inc 40 Carburetion Motor Fuel Tanks Manchester Pick up In Bed Mount Tanks Large capacity bed mount tan
11. Manual for further information Repair Kit Description RK VFF30 2 Vacuum Fuelock Filter Repair Kit c o Fu fe pus D O m GAS EQUIPMENT COMPANY Inc Carburetion Accessories Filter Description F 201 Filter only for LPG 14 female inlet x 14 male outlet 408A3 2M Trap It Filter F 201 Fuel Shut offs Lockoffs Electrical Operating Filtration Mounting Fuel Type Pressure Flow Rating Temperature dice Certification Requirement Range Requirement Postition Any 40 Micron 24 6 gal h FL Z18 12V PG Liquid Vapor E e 12 VDC or Low Pressure 250 psi l 40 F to 250 F FL 418 12V Natural Gas Vertical or Horizontal FL 218 12V FL 418 12V Inlet 44 FNPT x 1 7 1 5 Outlet 4 MNPT Outlet 4 MNPT 0 Q oO Qo cu le gt GAS EQUIPMENT COMPANY Inc 383 Carburetion Adapter System Unidapt Impco s modular carburetor adaptor system Light weight die cast components for custom fit installation of Impco CA 125 and CA 300A series mixers The modular system offers selection and combination of inter changeable components to satisfy most space requirements and gasoline carburetor air horn size SS Pat Description Part Description Part Description CA175 amp CA300 Adapter Unidapt mixer A1 53 Adapter to CA125 series mixers Adapter assy A1 57 hood G1 135 gasket 81 5 screws 4 e A
12. Verify the condition Perform visual inspection of fuel system components and attempt to start engine Use open throttle Check fuel tank valve Check hose fittings and VFF30 filter for restrictions Engine does not start Engine starts Possible cause Lack of priming or over priming Review proper starting technique with driver If over priming is suspected refer to Explain reasons for open throttle conditions Cold ambient air temperature Test for battery voltage and continuity to ground in the electrical primer circuit during cranking Circuit complete Circuit incomplete Repair circuit as necessary Jump battery to primer contact Primer clicks engine does not start Primer does not click Possible cause Vacuum and or air leaks Replace primer Check for loose carburetor mounting bolts or a leaking mounting gasket Tight mounting Loose leaking mounting Tighten mounting bolts or replace gaskets Check for cracks in the gasoline carburetor c o Ve L 2 U I 8 housing if dual fuel or intake manifold Carburetor O K Cracks noted Possible cause Improper idle mixture Replace the carburetor or intake manifold e GAS EQUIPMENT COMPANY Inc
13. as A9 50 but low profile 1 2 taller than A9 54 4 34 high 7 8 high GAS EQUIPMENT COMPANY Inc 393 Carburetion Gann Adapters Gann Adapters Pas Description Pars Description Part Description 7 Allows use of OHG X 450 on 90 degree mounting of IMPCO I Adapts OHG X 450 to 3 1 4 or f CA 425 on 5 1 8 air horn gees 3 1 2 single hose Steel 1 high Cues is id De TO part cast aluminum adapter sim GE ply mount the X 450 on the top A9 60 X 450 half mount the bottom half on the throttle body then assem ble the two halves Gaskets andhardware included 1 high Pana Description Pans Description Panz Description Aluminum bonnet connects A9 59 Adapts CA 425 to 3 1 4 or Allows use of CA 425 on Dodge Ford single hose 3 1 2 single hose Steel 1 high V 10 engines Same style as 3 intake to either X 450 or CA 425 A9 60 425 A9 80 X 450 above Gaskets and hardware included 1 high UN GM Quadrajet to IMPCO CA 425 Mounts the OHG X 450 to TB9 8 throttle body and any existing throttle body utilizing the IMPCO CA 425 bolt spacing Has vacuum port for distributor Gaskets and screws provided 1 1 8 high Carburetion v GAS EQUIPMENT COMPANY Inc Carburetion Fittings Nylon Elbows Nylon Straight Part Hose NPT Nylon Crankcase Vent Fitting Assembly Nylon Fuel Pump Plate Part Hose NPT Gasket
14. co O Ci CON O OO O N O 0 Co N O O OO 7 AL1 11 1 es 1 11 1 S2 15 1 SES Q ST 32 d Grad E Flange 1 1 4 2B with gasket et Flange 1 1 2 2B with gasket 9 Flange Holley 2B with gasket BT2 15 Flange 1 1 2 GMC 2B with gasket 2 L UNE NE 81 19 Screw 12 24 x 58 SEMS 4 G1 47 Gasket Holley2B Flange G1 45 Gasket 1 1 4 2B Flange 48 G1 46 Gasket 1 1 2 2B Flange G1 49 Gasket 1 1 2 GMC 2B Flange GAS EQUIPMENT COMPANY Inc 38 Carburetion Vacuum Fuelock Filter Impco Model VFF30 Series 325 H P LP Gas metal Pata Description Screw 8 32 x 58 SEMS 6 C1 37 Cover diaphragm VFF30 only Diaphragm assy silicone BD1 27 Dan P2 28 2 R2 4 2 Screw 8 32 x 1 4 2 Fulcrum L1 39 Lever valve operating VV1 42 VVasher seal retaining AB1 34 Body assy B1 34 J1 8 Screw 1 4 20 x 58 SEMS 2 Seat valve Pin valve operating Seal O ring Spring valve Screw 8 32 x 5 16 SEMS Screen filter backup Filter Filter assy F1 10 S7 3 G1 89 Gasket filter cover C1 38 Cover filter S1 100 Screw 12 24 x 34 SEMS 10 7 10 11 12 13 14 15 16 17 1 NO cO co NOTE O ring must be secured with washer when service is required Washer is installed through LP gas outlet and locked in slot by pin Silicone grease will let pin slide easily Be sure to properly lubricate O ring Refer to Service
15. correctly size the air flow capacity of the mixer to the engine requirement amounts of LP Gas vapor around suspected air leaks down stream of the air valve It is suggested that an unlit propane cigar lighter be used since a small flow is all that is necessary If a leak is located the engine will speed up due to the richer mix ture This technique is quite effective around the gasoline car buretor area Take care to do this out of doors since adequate ventilation is a must Air leaks may also be found in the engine through intake valve seals or past rings which are not seated The orifice in the PCV valve which is open during cranking and closed under vacuum can add a sizable amount of air Be sure PCV valve does close properly after engine starts Use of a mixer that is too large for the engine displacement makes idle adjustment extremely sensitive When the larger mixers are applied to smaller engines enrichment for accelera tion or power occurs too high in the RPM range to be practical The small engine cannot lift the large air valve quickly or as high as a larger engine will Idle Mixture Adjustment Correct idle mixture adjustment is critical to ease of starting This is compounded if the mixer is oversize for the engine When the idle mixture air by pass adjustment is closed the air valve will open farther at cranking Thus the air flow volume remains the same but gas is increased If the engine starts hard che
16. diameter 38 x 1 2 x 1 2 i d db Li 4l de po cmm J 5 TIE TA r6 k ST 244 144A 344 Solderless Terminals Pane Description 44 5210 Ring terminal 0 Q oO O et le 44 3200 Push on terminal male spade 44 9200 Push on terminal female disconnect VT SI 44 6210 Spade or fork termnal 4 1 1 44 5210 44 3200 44 9200 44 6210 42 2003 GAS EQUIPMENT COMPANY Inc 399 Carburetion Miscellaneous Benefits of Fresh Air Horsepovver is directiy related to the temperature of the air intro Example duced into the carburetor For every 10 F of temperature A vehicle producing 1OOHP at 160 F intake air Reducing the increase above 60 F you will lose 1 of available horsepower air temperature to 100 F by bringing in outside air will increase The opposite is also true horsepower by 6 The net increase would be 6HP 4 Flexible Duct Description H5 1 4 x 48 flexible duct Fresh Air Inlet Shroud Description S6 1 4 shroud Converter Mounting Brackets All brackets include mounting hardware GB80 Mounts Century G85 Most forklift applications Mounts the Century GB85 converter on the GB86 l engine carburetor mounting flange Accomodates Beam 400 120 Century M4 GB87 M5 H IMPCO model E Slots are 1 4 x 1 12 Includes strap brace c For farm tractor industrial large forklifts GB88 o GB88 Mounts Beam 400 120 Century M4 M5 H D
17. flange G1 23 Gasket 1 34 flange G1 66 Gaskets 1 1 4 1 1 2 flange GAS EQUIPMENT COMPANY Inc 371 Impco Model 125 Series Natural LP Gas A F ee Standard Throttle Center to Mixed Overall h Carburetor Body Center Bolt Air Horn i Height Spacing in Diameter lE CAT252 DES CA125M 5 9 16 CA125 6 6 1 LER waer awe Additional KUN Throttle NEM x c o nud gt D pum O 372 GAS EQUIPMENT COMPANY Inc Carburetors Impco Model 125 Series Ret Pata Deseripion 1 Screw 1 4 20 x 1 SEMS 2 6 S1 22 Screw 6 32 x 1 4 SEMS 4 3 Diaphragm lox Diaphragm silicone 4 SIT Hngervave Valve and diaphragm assy complete refer to chart for correct air gas valve assembly 5 6 7 Plug 1 8 pipe brass Screw 12 24 x 58 SEMS 4 8 T2 2 Throat 1 SAE flange Co 2 Throat 1 1 4 SAE flange short lt ID Throttle shaft 1 4 dia T2 1 T2 2 Throttle shaft 5 16 dia T2 3 T2 4 1 T2 4 3 T2 16 T2 23 13 F24 IA 22 R F2 4 Fly 1 1 2 14 Fly 1341 15 Screw 6 32 x 1 4 SEMS 2 12 Screw 8 32 x 5 116 SEMS 2 e 16 Bearing Oilite 1 2 i d 2 Bearing Oilite 5 16 i d 2 l 17 Bearing needle 1 4 i d optional 2 Bearing needle 5 16 i d optional 2 18 Seal 1 4 shaft 2 Seal 5 16 shaft 2 Sea
18. is included 622 N 1 34 bolt center BAEN T2 O O e ai r 5 GAS EQUIPMENT COMPANY Inc 395 Carburetion Gann Hose Fittings Zinc Straight Hose Nipples Brass Straight Hose Nipples Zinc material die cast and machined All brass fittings produced from extruded bar stock 54 SB SL SES 38 S7 Also available in nylon Also available in nylon Zinc Brass Zinc Hose Elbows Crankcase Vent Fitting Assemblies Die cast machined zinc material unless otherwise noted Illustrated is the Impco 300 Mixer with Gann 54EN 12 fitting to adapt crankcase ventilator hose Includes 2 jam nuts and gasket Zinc material unless otherwise noted 44E 12 12 x 2 54E 12 54EN 12 yo x 1 2 Nylon 64E 12 3 4 x 1 2 Also available in nylon Zinc amp Nylon Brass Hose Elbows All brass fittings produced from extruded bar stock Hose NPT Also available in nylon c o Fu fe pus D O 396 GAS EQUIPMENT COMPAN Y Inc Carburetion Miscellaneous Fittings Plastic Tie Straps Plastic tie strap positive lock 7 inches long _ SST2 Positive lock 7 inches long Compression Connector Part No 68A Tubing to male pipe 5 16 x 1 8 Description 1 34 bolt centers 7 16 thick includes gasket 2 58 bolt centers includes gasket 2 1 8 bolt centers 7 16 thick includes gasket 622 622 N 613 A Water Hose Connections
19. 1 19 Screw 12 24 x 58 SEMS 4 T2 1 Throat 34 SAE flange T2 2 Throat 1 SAE flange Throat 1 1 4 SAE flange T2 4 1 Throat 1 1 2 SAE flange T2 4 3 Throat 1 3 4 SAE flange T2 16 Throat 1 1 4 8 1 1 2 SAE flange short T2 23 Throat 1 1 4 SAE flange short Pin throttle stop 2 Throttle shaft 1 4 dia T2 1 T2 2 Throttle shaft 5 16 dia T2 3 T2 4 1 T2 4 3 T2 16 T2 23 Fly 34 F2 2 Fly 1 20 F2 3 Fly 1 14 F2 4 Fly 1 12 F2 5 Fly 1 34 81 22 Screw 6 32 x 1 4 SEMS 2 91 12 Screw 8 32 x 5 16 SEMS 2 Bearing Oilite 1 2 i d 2 B2 12 Bearing Oilite 5 16 i d 2 B2 6 Bearing needle 1 4 i d optional 2 B2 7 Bearing needle 5 16 i d optional 2 Seal 1 4 shaft 2 Seal 5 16 shaft 2 S3 25 Seal internal 5 16 i d optional 2 Ring seal retainer 2 AL1 8 1 Throttle stop assy 1 4 i d L1 8 1 S2 15 S1 21 S1 18 AL1 8 2 Throttle stop assy 5 16 i d L1 8 2 S2 15 S1 21 S1 18 Throttle stop lever 1 4 i d L1 8 2 Throttle stop lever 5 16 i d Spring idle stop screw 28 Screw 10 32 x 34 Pin screw throttle stop Throttle lever short w screw S1 1 L1 7 3 E Throttle lever long w screw S1 1 L1 7 1 G1 16 Gasket 3 4 flange 31 N j Y S e Co Co h I DI ae col co 0 Q oO O et le G1 17 Gasket 1 flange G1 18 Gasket 1 1 4 flange G1 19 Gasket 1 1 2
20. 1 4 i d optional 2 Seal 14 shaft 2 R1 9 Throttle stop assy 1 4 i d L1 8 1 S2 15 S1 21 S1 18 SEL Gasket 1 2 flange Gasket 3 4 flange G1 17 Gasket 1 flange G1 18 Gasket 1 1 4 flange 4 AB1 35 3C AB1 35 4C AB1 35 5C AV1 14925 uoneinqiey GAS EQUIPMENT COMPANY Inc 369 Carburetors Impco Model 100 Series Natural LP Gas Standard Carburetors Standard Throttle Center to EE NM Overall Carburetor Body Center Bolt Air Horn Vera Height Spacing in Diameter CA100 2 Cam 1 AT2 1 214 CA100 4 4 AT2 2 6 ES 2 2 1 4 T ESI Asa 2 11 16 5 7 8 CA100 10 _A400M 4 2 516 CA100 12 AT2 4 1 2 15 16 1 46 CA100 26 CA100M 3 AT2 2 2 1 46 CA100 44 CA100M 1 AT2 2 11 46 5 78 CA100 46 CA100M 4 AT2 4 3 3 5 16 2 5 16 t CA100 58 CA100M 5 AT2 1 2 1 4 c o nud gt D pum O GAS EQUIPMENT COMPANY Inc Carburetors Impco Model 100 Series Reis Part Deseription Screw 10 24 x 58 SEMS 4 C1 17 Cover 92 85 Spring air valve 981 22 Screw 6 32 x 1 4 SEMS 4 P2 22 Plate backup D1 17 Diaphragm D1 17 2 Diaphragm silicone H1 19 Ring air valve BV1 14 Air gas valve assy V1 14 S4 12 V2 7 AV1 14 Valve and diaphragm assy complete Body assy B1 8 V2 6 W1 12 W1 13 EE W1 14 R112 P3 8 51 69 S1 69 51 74 52 88 Plug 18 pipe brass G1 11 Gasket throttle body to mixer S
21. 25M Mixer Impco Lean Idle Condition Model 425 Series The pictures of the idle diaphragm assemblies show a correct and an incorrect assembly configuration The assembly with the straight lever allows normal movement of the Viton valve off the valve seat providing a full opening of the idle gas jet when adjust ed rich The bowed lever reduces available lift off the seat by lim iting the travel The bowed assembly can be straightened easily by bending to conform to a straight edge ruler or equivalent In reassembling the idle diaphragm cover to the body the idle mixture adjustment screw must be backed out until it is engaged by only three or four threads in the cover This will allow assembly of the cover to the body and idle diaphragm assembly without bending the tip of the lever Correct Assembly Configuration Overall Height 425 1V Illustrated After the diaphragm and cover are reassembled the idle mixture adjustment screw may be turned in until the retainer spring is compressed about one third With the engine running at idle adjust the screw in or out for best idle vacuum If the idle mixture is set with a cold motor to the smoothest pos sible idle the mixture when the engine is hot will lean out to a practically ideal mixture for minimum CO readings without being too lean thereby causing misfire o Incorrect Assembly Configuration 380 GAS EQUIPMENT COMPAN Y Inc Carburetors Impco Model
22. 47 Screw 1 4 20 x 1 SEMS 1 3 Screw 10 24 x 58 SEMS 5 C1 25 Cover air valve 92 17 Spring air valve 91 12 Screw 8 32 x 5 16 SEMS 4 P2 21 Plate backup D1 16 1 Diaphragm D1 16 2 Diaphragm silicone H1 17 Ring air valve BV1 12 Air gas valve assy propane V1 12 S4 9 V2 16 DV1 12 Air gas valve assy natural gas V1 12 84 9 V2 17 AV1 12 Air gas valve assy complete w diagram propane CV1 12 Air gas valve assy complete w diagram natural gas AB1 23 Body assy B1 23 V2 10 W1 18 W1 19 W1 20 S2 16 Spring idle screw 1 28 Idle screw S1 69 Screw 1 4 28 x 5 16 3 P3 3 Plug 1 8 pipe brass G1 21 Gasket throttle body mixer S1 19 Screw 12 24 x 5 8 SEMS 4 T2 4 2 Throat 1 1 2 SAE flange T2 5 Throat 1 1 4 SAE flange T2 6 Throat 2 SAE flange Pin throttle stop 2 S5 2 Throttle shaft 5 16 diameter T2 4 2 S5 3 Throttle shaft 3 8 diameter T2 5 T2 6 Fly 1 1 2 F2 5 Fly 1 1 4 F2 6 Fly 2 1 12 Screw 8 32 x 5 16 SEMS 4 B2 12 Bearing Oilite 5 16 i d 2 B2 13 Bearing Oilite 3 8 i d 2 Bearing needle 5 16 i d optional 2 Bearing needle 3 8 i d optional 2 a 32 Seal 5 16 shaft 2 i 22 30 3 Seal 38 shaft 2 a 8 Seal internal 3 8 i d optional des j Ring seal retainer 5 16 shaft 2 0 rr AN 7736 Ring seal retainer 3 8 shaft 2 Y x P d e Throttle stop assy 5 16 i d L1 8 2 S2 15 S1 21 S1 18 an E O 25 27
23. Description Kit 2335B Applications up to 85 HP 286 1554 Large engine application s 2504A up to 350 HP 286 1688 Model G 85A Model H Repair di e Repair Part Description Kit Vt Parte Description Kit Air heated converter for Small engine application 1477B ia engines up to 85 HP s L TI LI up to 135 HP eco Century Converter Repair Kits For Convertor Model 286 1301 286 1332 286 1554 286 1688 Century Speed Control Can be used for any application where a consistent fast idle speed is repeatedly required It is designed especially to con trol engine speed while pumping from a bulk truck Part Description 2229B Century Speed Control c o nud pum D O 388 GAS EQUIPMENT COMPAN Y Inc Carburetion Gann Adapter Systems Gann Adapter Systems Part niet Description A9 40 Has two 2 1 4 diameter inlets Nylon composite material for connection to OEM air box 3 high How Gann Adapter Systems Work O O ei et O GAS EQUIPMENT COMPANY Inc 380 Carburetion Gann Adapters Gann Adapters Pans Description Mounts the IMPCO CA 225 to TB9 1 throttle body Non offset to facilitate installations where air cleaner is a problem 1 8 high Pane Seege Mounts to TB9 3 throttle body for IMPCO CA 425 application Cannot be used on original gasoline throttle bodies Has primary vacuum port Gas
24. IMPORTANT INFORMATION Product must be installed and used in strict conformance with NFPA Pamphlet 58 and or NFPA Pamphlet 54 and all other codes regulations and manufac turer recommendations Failure to follow these codes regulations and recommendations could result in hazardous installation bodily injury and or death PRODUCT TRAINING SCHOOLS AVAILABLE Contact a GEC customer service representative for more information WARNING LP Gas is extremely flammable and explosive Devices used for handling LP Gas and Anhydrous Ammonia must be installed and used in strict conformance with NFPA Pamphlet 58 and 54 and all other codes regulations and manufacturer rec ommendations O O e ai r 5 GAS EQUIPMENT COMPANY Inc 359 Carburetor Sizing Selecting the Correct Carburetor Size Formulas for Cubic Feet Per Minute CFM Air Flow Re quirements Determining specific airflow requirement for any engine requires only the application of the following formulas Naturally Aspirated Engines Carbureted CID x RPM 1728 2 x 85 CFM Required The engine air flow requirement determined by this formula is at 85 of volumetric efficiency for four cycle engines For two cycle engines double the cubic feet minute valve 1 Determine the cubic inch displacement of the engine from the identification plate or the user s manual If the displacement is known in cubic centimeters convert to cubic inches by mul tiplying cubi
25. L 8 SS25UL 10 Use only with Parker Dayco series BN hose end fittings Hose Ends for Parker Dayco Series 7243 wire braid hose HoselD Flare Size Description Coupling P N Use with Hose 6 AMP Carburetion ES SFS SS25UL 8 6FS 8 10 SS25UL 10 6FS 10 SS25UL 10 398 GAS EQUIPMENT COMPAN Y nc Carburetion Miscellaneous Fittings Plastic Primary Wire Boden Wire Control Cable Smooth finish thermoplastic insulation stranded copper conduc tor Provides good flexibility and color permanence Impervious Description to oil grease and diesel fumes 6 feet w chrome T handle not shown Panz Description Primer Switch Rocker Switch Heavy duty for either 6 or 12 volts Has two binding head screw 3 positions on off on 6 terminals terminals Mounting stem has ee thread is Ye long 9279 Description 5596 R 3 positions on off on 6 terminals 3 Way Switches Pate Description 3 positions on off on 3 screw 5586 terminals U L approved for 15 amps at 125 VAC 10 amps at 250 VAC 3 positions on off on 6 screw 5592 AE terminals for 2 circuits 5592 1 3 positions on off on 6 spade terminals for 2 circuits 82614 3 positions on off on 9 terminals 0140 4023 3 positions on off on 12 terminals at ra i set Ni cas qura J wt LP gas gasoline switch bracket s i Ae he 244 For Boden wire and lockoff switch 2 mounting screws included Hole
26. ate the possibility of an ignition problem Possible cause Incorrect spark plug gap Remove spark plugs and measure for correct gap Spark plug gap is correct Spark plug PP is incorrect Verify that rest of ignition system is in good Clean and gap spark plugs 080 to 032 working order If no problems are found investigate the possibility of engine mechanical problems Possible cause poor engine condition Check engine for compression of 150 PSI or better Engine condition poor at cranking Inspect for air leaks downstream of the air valve Repair and seal air leaks Engines with less than Possible cause Weak current to electric gasoline or LP Gas fuel lockoff O O e ai r 5 150 PSI compression may require valve grind valve seals and or rebuilding to obtain optimum starting GAS EQUIPMENT COMPANY Inc 405 Carburetion Impco Starting Problems Troubleshooting Hard Starting Insert matchstick into VFF 30 atmospheric vent front cover Diaphragn within should resist pressure Indicating fuel supply to regulator Fuel supply O K No fuel supply Possible Cause Cold ambient air temperatures Verify that there is no over priming Disconnect SV valve if over priming exists Engine does not start Engine starts Possible cause Improper starting technique Insert orifice in 4 SV valve hose Refer to Start valve enrichment section
27. c centimeters by 06102 If in liters convert to cubic inches by multiplying liters by 61 02 2 Multiply the figure by the RPM figure corresponding to the maximum engine speed at wide open throttle Use the point at which the tachometer is redlined If the engine is not equipped with a tachometer refer to the users manual sup plied with the vehicle or engine 3 Divide this CIM cubic inches per minute by 1728 to obtain cubic feet per minute Divide the result by 2 for 4 stroke engines 5 Multiply the figure you obtain by 85 For 85 volumetric efficiency 6 This figure is the precise air flow requirement for the engine accurate to one cubic foot minute Example 351 CID x 4000 RPM 1 404 000 cubic inches per minute 1 404 000 1728 812 5 CFM 2 stroke 812 5 2 406 25 CFM 4 stroke 406 25 x 85 345 CFM at 85 volumetric efficiency Impco Carburetor Mixer Sizing As It Relates to Air Flow Fuel Injected Engines Due to improved intake manifold design use 100 of volumetric efficiency for fuel injected engines CID x RPM 1728 2 CFM required Example 351 CID x 4000 RPM 1 404 000 CIM 1 404 000 1728 812 5 CFM 2 stroke 812 5 2 406 25 CFM 4 stroke 406 25 X 406 25 CFM at 100 volumetric efficiency Turbocharged Engines with mixer upstream of turbocharger CID x RPM 1728 x 2 x boost pressure 1 CFM Required Normal air inlet pressure to the engine is 14 7 PSI one atmo
28. ck the idle mixture adjustment fol lowing this procedure Tighten the idle mixture screw in If the engine starts more easily slow the engine down while adjust ing the idle mixture to prevent stalling from an over rich mixture Setting the idle mixture to the best idle high vacuum cold will give a reasonably lean but satisfactory mixture after the engine warms If the idle adjustment must be backed out excessively in order to obtain a smooth idle this may be compensated for by installing an R1 29 spacer ring for CA125 mixer Placed between the air valve ring R1 19 and the air valve shoulder it raises the R1 19 by 003 thereby increasing air flow at idle This allows the idle screw to be adjusted in to richen the mix ture shutting off most of the bypass air and lifting the air valve farther off the seat during cranking Setting the idle on a CA300A mixer is touchy on a small engine because of the large gas valve With the gas inlet elbow removed screw the idle adjustment in until the rubber valve contacts the seat and stops turning Back the adjustment out 4 turn re install elbow Advance idle speed adjustment screw a turn or so to keep the engine running then start engine The idle should be set cold or cool Adjust the valve in and out gently to determine where the engine speeds up best vacuum For final setting slow idle speed to desired setting When testing between adjustments place finger over the opening to the idle
29. crew 1 4 20 x 5 8 2 36 NS Sina piney Co ns Eisem ie nes Dama primary Screw 8 32 x 1 1 8 Tork style 7 NSS Not Serviced Separately Included in Repair Kit Repair Kits Pars Description RK Cobra c o nud D pum D O we GAS EQUIPMENT COMPANY Inc Two Stage Converters Impco Model L Series 325 H P LP Gas Ref Part Description Screen atmosphere vent S1 59 Screw 8 32 x 58 SEMS 8 3 AC1 63 Cover assy secondary C1 63 P1 10 S2 21 W1 27 S7 4 W1 27 Washer hand primer AD1 30 Diaphragm assy secondary hydrin 5 D1 30 P2 16 P2 34 R2 4 2 AD1 31 Diaphragm assy secondary hydrin D1 31 P2 16 P2 34 R2 4 2 6 Uz S4 25 Seat secondary new 8 P7 Pin secondary lever fulcrum 9 S297 Spring secondary regulator blue S1 59 Screw 8 32 x 38 SEMS 6 11 C1 62 Cover primary diaphragm S2 92 Spring primary regulator 2 13 AD1 32 Diaphragm assy primary D1 32 P2 35 P2 36 R2 10 2 AB1 57 Body assy B1 57 J1 18 P3 13 Plug 1 8 pipe hex head 2 S1 59 Screw 8 32 x 58 SEMS 5 C1 61 Cover vvater passage G1 118 Gasket water passage Screw 1 4 20 x 58 SEMS 2 P1 34 Pin primary valve G1 119 Gashet vaporizing chamber AC1 64 Cover vaporizing chamber C1 64 J1 17 Screw 10 24 x 58 SEMS 9 a sc S4 23 Seat support primary S2 93 Spring primary valve ASH 23 18 Bu
30. dapter assy A1 59 hood Adapter assy A1 60 hood A1 62 Adapter to 3 1 8 air horn AA1 59 AA1 60 G1 135 gasket 81 5 screws 4 G1 135 gasket S1 5 screws 4 e Pare Description Part Description i A1 54 Adapter to 3 1 2 air horn A1 61 Adapter to 5 1 8 air horn A1 58 Adapter to Toyota air horn Part Description Part Description A1 55 Adapter to 2 5 8 air horn A1 56 Adapter to 2 5 16 air horn A1 63 Adapter to CA 300A series mixers c o Fu fe pus D O 384 GAS EQUIPMENT COMPANY Inc Carburetion Adapters A1 Series Adapters 300A and 175A mixers to gasoline carburetor air horn A1 3 1 4 3 S 1 1 4 300A amp 175A to 4 3 16 air horn 300A amp 175A to Chevrolet V8 1 1 4 duplex air horn 3 116 1716 300A amp 175A to 1 1 4 duplex air horn A1 16 1 300A amp 175A to 5 1 8 air horn Gann A9 20 B A1 16 2 300A amp 175A to 5 1 8 air horn Gann A9 21 A1 39 300A amp 175A to 2 58 air horn high profile AA1 40 2 58 1 12 300A amp 175A to 2 58 air horn w clamp nuts A1 38 N1 12 3 81 23 3 A1 41 2 M16 114 300A amp 175A to 2 5 16 air horn 300A amp 175A to 5 1 8 air horn offset EE KS For GM amp Chrysler requires spacer A2 73 A A9 22 300A to gasoline carburetor with 5 1 8 air horn Center Stud Air Horn Description ar m ant Desaipien uu para Deseo 300A amp 175A to 1982 and lat
31. e are many factors that can contribute to hard starting These are Vacuum and air leaks Incorrect carburetor sizing Improper idle mixture Over richening by start valve Incorrect location of carburetor regulator and or fuelock ae ae Ic Improper location of electric fuelock lead Poor engine condition Incorrect spark plug gap Cold ambient air temperatures 0 Incorrect starting technique di m q Vacuum amp Air Leaks In dual fuel applications on small displacement engines an air leak which would not bother a larger engine becomes critical especially at cranking speed Any leak downstream of the air gas valve will reduce the amount it will rise off its seat during cranking In extreme conditions air enters through the leak during the entire intake stroke while the gas valve is lifted only during part of the stroke This creates a mixture too lean to burn A primer may furnish the added fuel around the metering valve to allow the engine to start and with more numerous intake cycles the leak may be overcome Vacuum leaks may be detected by applications of small Carburetor Sizing Impco has found that the CA50 250L or 750L on engines of 1600cc amp under will give better performance and superior mileage as well as better starting than the CA125 The CA125 250 and 260 are adequate for engines 100 to 200 CID the CA300A for 200 to 320 CID and the CA300A 50 for 320 CID amp over It is important to
32. er Ad Ford 5 0L throttle body EFI AA2 46 apter assembly 90 degrees AA2 40 2 Adapter assembly 90 degrees 5 to CA425M low profile 5 CS to CA425M Gann A9 26 O O ei ct el GAS EQUIPMENT COMPANY Inc 385 Carburetion Air Filter Assemblies Impco AF1 Series Assy Applications Filter Cover Base Stud Dimensions Part Dm Part Part Part Part _A B C j L 9v 234 LAF1 11 500 CFM CAS00A F1 9 Ct 40 A226 14 318 17 12 L H W HE Jene 1546 Filter assembly fits on mixer Applications Filter Cover Base Stud Dimensions i Part Part Part Part A B C J Lars 600 CFM caros FIA cras rear aos o TE ag OO AF a leg Gu CA Te creo up I IR 3 E AR Add approximately 74 to height for stud and nut zn ue Impco Accessories Vacuum Power Valve Vacuum Control Solenoid Part Description Part Description Start Assist Valve Electric Primer r Electric solenoid for remote priming of Impco models D ription Parts Description E J or L and OHG X 1 or X 2 converters Start Assist Valve Part Description 46 1099 2104 386 GAS EQUIPMENT COMPANY Inc c o nud pum D O Century Fuelocks Description Filter fuelock for LPG 1 4 FNPT in out 12V Chamois pack filter Replacement filter kit for part 2384B Fuelock for gas
33. gas valve assy V1 12 S4 9 V12 16 Air gas valve assy complete with diagram refer to chart for correct air gas valve assy Body assy 2 58 air horn B1 11 1 V2 10 W1 18 W1 19 W1 20 R1 13 Body assy 3 1 16 air horn B1 11 2 V2 10 W1 18 W1 19 W1 20 R1 13 Spring idle screw Idle screw Gasket throttle body to mixer Screw 12 24 x 58 SEMS 4 Plug 1 8 pipe brass Throat 1 1 2 SAE flange Throat 1 1 4 SAE flange Throat 2 SAE flange Pin throttle stop 2 Throttle shaft 5 16 diameter T2 4 2 Throttle shaft 38 diameter T2 5 T2 6 Fly 1 1 2 Fly 1 34 Fly 2 Throat 1 1 4 amp 1 1 2 SAE flange short Throat 1 1 4 SAE flange short Screw 8 32 x 5 16 SEMS 4 Bearing Oilite 5 16 i d 2 Bearing Oilite 3 8 i d 2 Bearing needle 5 16 i d optional 2 Bearing needle 38 i d optional 2 Seal 5 16 shaft 2 Seal 38 shaft 2 Seal internal 3 8 i d optional Ring seal retainer 5 16 shaft 2 Ring seal retainer 3 8 shaft 2 2 F D NI N N N sch sch a O1 Sl G N cO IN D ol Go IO O Gei 0 de dd add AJ x dl P I I gi N R1 17 BV1 12 AV1 12 AB1 11 1 b AB1 11 2 S1 69 S1 28 b Q sch I hi sch QU N ee UJ de Co Throttle stop lever 5 16 i d Throttle stop lever 38 i d 92 15 Spring stop screw 81 21 Stop screw 10 32 x 34 91 18 P
34. in screw throttle stop Throttle lever with S1 17 L1 7 1 Throttle lever with S1 26 L1 9 1 Throttle lever O Q oO O le Screw 10 24 x 58 Screw 12 24 x 58 Gasket 1 1 2 flange Gasket 1 34 flange Gasket 2 flange GAS EQUIPMENT COMPANY Inc 375 Carburetors Impco Model 225 Series 1V Natural amp LP Gas Standard Carburetors Standard Throttle Center to Overall Carburetor Body Center Bolt Air Horn Medis Height Spacing in Diameter 225 52 225M AT2 4 2 2 1516 7 1 4 225 54 225M AT2 5 3 b 16 7 1 2 225 56 225M AT2 6 3 9 46 CA225 52 CA225M AT2 42 2 1546 7 1 4 CA225 54 CA225M AT2 5 3 16 5 13 16 7 1 2 CA225 56 CA225M AT2 6 3 9 46 DG225 52 DG225M AT2 42 2 1516 7 1 4 DG225 54 DG225M AT2 5 35 16 7 1 2 DG225 56 DG225M AT2 6 3 9 46 NOTES kA gt 1 Order air cleaner assembly separately 2 Order air horn separately refer to optional equipment for specific air horn Model 225 Series 2V Natural amp LP Gas Standard Carburetors Standard Throttle Center to Carburetor Body Center Bolt Air Horn Spacing in Diameter NOTES 1 Order air filter separately 2 Refer to optional equipment for dimension information Overall Height c o nud pum D O e GAS EQUIPMENT COMPANY Inc Carburetors Impco Model 225 Petz Part Description G1 73 Gasket mixer to air horn 81
35. ith power adjustment E1 4 V2 9 W1 12 W1 14 W1 15 5 R1 93 Ring seal retainer Seal idle screw Elbow assembly complete P3 2 AE1 4 R1 9 S3 3 Screw idle adjustment Seat gas valve CA300A only 54 20 Seat gas valve CA300A 50 only V2 11 Valve gas metering CA300A only Refer to chart for correct gas valve V2 39 Valve gas metering CA300A 50 only I Refer to chart for correct gas valve Spring gas valve AV2 11 Gas valve assy complete S1 15 S4 2 V2 11 S2 3 CA300A only AV2 39 Gas valve assy complete S1 15 S4 20 V2 39 S2 3 CA300A 50 only Screw 10 24 x 1 3 Nut dome 10 24 3 Washer No 10 light flat 6 Gasket filter cover Rivet vent valve Valve cover vent Cover diaphragm CA300A only C1 2 3 Cover diaphragm CA300A 50 only AC1 2 Cover assy diaphragm w vent valve R2 2 V1 13 C1 2 CA300A only AC1 2 3 Cover assy diaphragm w vent valve R2 2 V1 13 C1 2 3 CA300A 50 only Spring air valve 1 1 Screw 8 32 x 5 16 SEMS 4 Plate diaphragm backup 7 UJ E1 4 1 81 15 O T no OD OO P WN GO WI C2 CA GO G r GO CO Cu N NI INI NINSI N INI DO PO NO Co o O1 BOI NJ o co CO NI ON Oy DW IN CH CO OO NI CO oR ao N SEES molo G LE apres N rs N P t Diaphragm air valve D1 1 2 Diaphragm air valve silicone Gii Base he SS AV1 10 1 Air valve assy
36. k for narrow bed pick ups and trucks with utility bodies Fits all makes amp all years Valves installed vertically Gauge is visible through rear window for easy viewing Part Diameter Lenath WP WC LP Weight SE School Bus Tanks Widely used on large school buses Part Diameter Length WP w c LP Weight 207277 18 e0 312 PSI 813 gal 65 1 gal 221 ibs Under Tool Box Mount Tanks For Small pick up trucks or narrow bed full size pick ups Fits most makes and most years May require tool box to be raised Gauge on driver s side for easy viewing Part Diameter ELE AA mmm Lee 26077 80 87 a12 psi o 488607 Vapor Seal Box Tanks Universal manifold tank adapts well to vehicles with recessed or sloped trunk floors Adjustable mounting brackets on 12 tank Requires remote fill KCAL SE ae Slick Tanks Very popular tank for SEN vans Mounting aes 25 8 42 aso PSI 28127 20 2507 Extra Heavy Duty Strap Brackets Available in 14 through 24 diameters Required for school buses c o nud D pum D O Description 16 pair 3 d 18 pair S q 20 pair M 24 pair GAS EQUIPMENT COMPANY Inc Carburetion Impco Starting Problems Starting has never been a serious problem when dealing with straight LP gas engines However with dual fuel applications especially those under 250 CID ther
37. ket and screws provided 1 8 high Carburetion Description Mounts the CA 300A duel fuel mixer to the IMPCO CA 425 bolt spacing Gasket and screws pro vided 1 8 4 high Mounts the CA 300A duel fuel mixer to the IMPCO CA 225 bolt spacing Gasket and screws pro vided 2 34 high Description Mounts CA 300A to Ford Motorcraft carburetor by removing the original air horn and replacing with this adapter Gasket and screws provided 1 1 4 high Pana Description Mounts on CA 125 carburetor and provides for the mounting of the original air cleaner on GM V 6 engines 2 1 4 high Part Description A9 19 CA 125 to CA 225 bolt pattern 3 4 high Parti Description Mounts IMPCO CA 300A to A9 20 existing gasoline carburetor with a 5 1 8 air horn 3 1 2 high Description Mounts the CA 300A to existing gasoline carburetor 2 YA high A9 21 390 GAS EQUIPMENT COMPAN Y Inc Carburetion Gann Adapters Gann Adapters Pans Description Mounts the IMPCO CA 300A to existing gasoline carburetor with a 5 1 8 air horn 2 38 high Pana Description _ Adapts IMPCO CA 175 and CA 300A to Ford port injected engines Parta eege Connects IMPCO CA 300A to air induction system on Ford fuel injected systems large and small hosed plastic nylon composition Description Fits GM 220 fuel injected carburetors including 5 0L A9 28 3 5 7L
38. l internal 5 16 i d optional 2 19 Throttle stop assy 1 20 2 456 AL1 8 2 To ge Throttle stop lever 1 4 i d O 2194 L1 8 2 Throttle stop lever 5 16 i d 22 25 m S2 15 Spring idle stop screw 51 21 Screw 10 32 x 34 S1 18 Pin screw throttle stop AL1 7 3 Throttle lever short w screw S1 1 L1 7 3 0 DA ung O o et AL1 7 1 Throttle lever long w screw S1 1 L1 7 1 34 9 SEL GT17 Gg G19 G1 23 Gasket 1 34 flange G1 66 Gaskets 1 1 4 1 1 2 flange Ee E GAS EQUIPMENT COMPANY Inc 373 Carburetors c o Fu gt Le pus D O Model 200 Series Natural amp LP Gas Impco Standard Carburetors A C F Standard Throttle Center to Mixed Guarani Carburetor Body Center Bolt Air Horn Vera Height Spacing in Diameter 200 2 soort ESTEE 2 15 16 2004 AT2 5 3 5 16 AT2 6 3 916 3 146 2008 8 200M 2 AT2 5 3 5 16 10 AT26 6 3 9 16 Sa DG200 1 ELM 2 15 16 DG2004 4 AT2 5 3 516 E DG200 2 AT2 6 3 9 16 3 146 738 DG200 8 8 AT2 5 3 5 16 NOTE 1 DG digester gas carburetors reduce air flow 30 GAS EQUIPMENT COMPANY Inc Carburetors Impco Model 200 Series LES Desege 1 Screw 10 24 x 58 SEMS 4 C1 18 Cover 92 17 Spring air valve 91 12 Screw 8 32 x 5 16 SEMS 4 P2 21 Plate backup D1 16 1 Diaphragm Diaphragm silicone Ring air valve Air
39. m flow rate is 115 cfm Various SAE flanges and airhorn sizes are available Standard Throttle Center to Mixed O I Carburetor Body Center Bolt Air Horn ML A in Spacing in Diameter 9 pu I OE dou er EE oa CA55 14 14 a 20 lal 2 CA55 40 A55M CA55 40 2 40 2 SE AT2 26 SEES 58 CA55M 3 CA55 64 GASS 66 CA55M 2 1 1 2 2 146 134 c o nud gt D pum O 368 GAS EQUIPMENT COMPAN Y Inc Carburetors Impco Model CA55 Standard Series Ret Pars Description Spring idle screw Plug 1 9 pipe 1 1 2 air horn assy B1 35 V2 29 VV1 14 W1 15 W1 43 P3 8 1 58 air horn assy B1 35 V2 29 W1 14 WS nh P3 8 1 7 8 air horn assy B1 35 V2 29 VV1 14 W1 15 W1 43 P3 8 2 1 16 air horn assy B1 35 V2 29 VV1 14 W1 15 W1 43 P3 8 1 34 air horn assy B1 35 V2 29 VV1 14 W1 15 W1 43 P3 8 Air valve assy std 54 12 V2 30 V1 14694 1 W1 14697 Air valve assy lean 84 12 V2 30 GENEE V1 14694 2 W1 14697 6 Ri 4698 Sealing ring air vave 8 AP2 14700 Chedevalve plate assy P2 14699 B3 14692 9 Gia Gasket throttle body to mixer Screw 10 24 x 58 SEMS 4 Throat 1 2 SAE flange Throat 34 SAE flange Throat 1 SAE flange Throat 1 1 4 SAE flange 91 22 Screw 6 32 x 14 SEMS 2 Fly 1 2 Fly 34 Fly 1 Fly 1 34 Throttle shaft 1 4 diameter B2 6 Bearing needle
40. mixture screw to prevent air entry Install idle adjustment plug after desired idle is obtained Use of the SV start assist valve for priming during cranking is helpful However on engines two liters and under a restriction such as the Impco J1 20 ae I D should be used If these are not available a spark plug nut approximately Ae 1 D pushed into the hose will prevent over priming Sizing the orifice to the engine can be checked for accuracy by energizing the SV valve separate from the starting circuit When activated with the engine idling it may slow the speed or actually kill the engine However if by opening the throttle it will start in a turn or two the orifice size is satisfactory The SV should always connect to air valve vacuum not intake manifold GAS EQUIPMENT COMPANY Inc 403 O O e et 5 Carburetion Impco Starting Problems c o nud gt D Lum O Location of Components Mounting the converter and fuelock off the engine is desirable when carbureting 4 cylinder engines The vibration of the engine moves the converter rapidly back and forth while the secondary diaphragm assembly tends to stay still This causes the gas pressure to pulse and can cause excess fuel consumption The added weight of an LP Gas mixer and adapter on a gaso line carburetor if not properly braced can combine with the vi bration of a 4 cylinder engine to cause the gasoline carburetor bolt
41. ncluded Recommended air filter F9 4 Pane Seege Adapts OHG X 450 mixer to GM throttle bodies for dedicated UG NG conversions 1 38 high Pana Description _ Mounts 300 A off center on A9 44 15 1 8 air horn in GM throttle body applications 3 3 4 high OR Adapter for large Ford port injection engines providing two hole 2 1 4 diameter inlets to CA425 Has two 1 2 NPT bosses for vent line A9 38 adapter only AA9 38 w adapter and screws Parta Description Allows use of IMPCO 200 IFB mixer on 4 6L EFI Ford Lincoln Mercury products Brass fitting included to create branch tee for idle speed control Mixer must be drilled and tapped 1 4 20 for VF 2 vacuum port 2 high GAS EQUIPMENT COMPANY Inc Carburetion Gann Adapters Gann Adapters Part Descripton Allows use of CA225 on 90 degree adapter to connect Connects Cle Fard intake Ford 5 0 5 8 liter engines 4 hose to 5 1 8 air horn to direct CA 300A Plastic Cast aluminum Cast aluminum Gonnecte dualiheseord intake GM vehicles with 5 1 8 air horns Right angle mounting of to 225 Molded plastic such as 4 3 5 0 and 5 7 liter CA 425 on 5 V8 air horn trucks and vans Mounts on 4 1 4 high either single stud or dual stud throttle bodies 2 3 4 high uoneinqiey Part Description Mounts CA225 on 4 9 liter Ford A9 50 2 conversions Same applications GER on 5 1 pron Hori Eois aka pan
42. oline 1 8 FNPT in out Replacement coil for part 2543A 12V Fuelock for LPG forklift application 1 4 MNPT x 14 FNPT 12V Replacement coil for part 2341 12V Repair Kits For Century Fuelocks For Description Fuelock Repair kit with plunger Coil only 12V 323 526 2384B 323 529 Coil amp cover assembly 12V 323 520 2341 Replacement coil amp cover 12V 323 562 2543A Replacement coil amp cover 12V Universal Bulkhead 2655 Description Universal bulkhead Filter for LPG Two openings for inlet side to accomodate hydro stat relief valve 12V Chamois pack filter 286 1794 Replacement filter kit Approved Vacuum Switch Description 140 10 Vacuum switch will not allow LPG lock off to open until engine is running or cranking GAS EQUIPMENT COMPANY Inc Carburetion Century Fuelocks 2384B 2341 387 O O ei ct el Carburetion Century Converters Century Converters Century offers a complete line of straight fuel carburetors for Century offers a full range of converters to cover every applica highway and industrial use Call for additional information on tion need These converters can be used for either straight fuel your particular application Additional literature is available or dual fuel installations All units are available with solenoid primer Model G 85 Model M 6 DS Repair pena Gen TES Repair Part
43. onnected The primer can be disconnected by removing the electrical connec tor or by pinching the fuel hose e GAS EQUIPMENT COMPANY Inc Carburetion Impco Starting Problems Troubleshooting Hard Starting Check idle mixture for proper setting Richen idle mixture as an aid to starting 300A mixer idle screw out counter clockwise turn CA425 out one to two turns CA 125 CA 225 idle screw in clockwise two turns Idle mixture properly set Idle mixture out of adjustment Refer to Idle mixture adjustment section for proper Possible cause Oversize carburetion sizing setting technique Verify that airflow capacity of mixer is correctly sized to engine requirement See IMPCO publication SL 7 How to select the right carburetor Mixer is of proper capacity Mixer is of improper capacity Possible Cause Loose vapor hose fittings or Replace mixer with one of proper airflow leaking vapor hose capacity Check vapor hose and fittings with soap and water solution to detect leaks Hose and fittings not leaking Hose and fittings leaking Replace leaking vapor hose Tighten or replace loose fittings Check that power lead is not connected to an ignition coil terminal Power lead is connected to strong source Power lead is connected to ignition coil terminal Hard starting is apparently not a fuel related Reconnect lead to strong source of 12 VOLT current problem Recheck the system and investig
44. por outlet pressures are available Orange secondary spring gives nega tive Yo water column Blue secondary spring gives negative 1 Yo water column To change any B regulator to O change blue secondary spring to orange Due to lower rate of water flow in industrial applications Model E is rated at 200 H P in these installations Indicates repair kit components For Model E only NOTE 2 PE Series does not carry UL approval Repair Kits Part Description c o Fu fe pus D O 364 GAS EQUIPMENT COMPANY Inc Regulators Carburetors Impco Model T60 Regulator bai bar Desorption 1 P316699 001 Plug 1 8 Socket Head Steel New P3 13 Plug 1 8 27 NPT 1 Current NSS Casting Regulator Body NSS Diaphragm Assembly 1 2 NSS Cover Primary Regulator NS Spring Primary 1 NSS Screw Retainer Adjustabel Spring P3 17956 8 Plug Expansion 1 2 60 4 Spring Primary Lever 1 NSS Lever Assy Primary 1 2 NSS Screw FIL HD 10 32 UNF 2A x 31 L Current NSS Screw M5 x 0 8 7 9 FIL HD Torx New NSS Bridge Primary NSS Pin Primary Pivot 1 NSS Screw 10 32 x 62 Torx 1 NSS Screw Torx Tamp Res M5 x 16mm New 8 9 1 Diaphragm Assembly Vac Lock 1 2 17 6022AN Diaphragm Secondary 1 2 7 m Cover Assy W Primer amp Mounting Tabs New Cover Assy W Mounting Tabs New Screw Pan HD 10 32 x 38
45. s and screws etc to loosen causing air leaks Keep the atmospheric vent of the regulator out of the direct air stream of the fan This also can cause fluctuation of the second ary diaphragm and result in gas pressure pulsations Electric Fuelock Connection Is often a source of starting trouble Attaching the electric fue lock power lead to an ignition coil terminal This is a weak source of current And it robs the ignition of needed amperage Engine Condition As previously mentioned the engine itself can be a source of air leaks Leaking intake seals poorly seated rings and leakage through the PCV valve hose are problem areas to be checked Beyond these problems however the engine must be in good working order Check the engine for any leaks downstream of the air valve Compression pressure of 150 psi or better at cranking is desirable to prevent hard starting Incorrect Spark Plug Gap Spark plugs should be in good condition and gapped to 03 to 032 A protruded nose plug is helpful if it will clear the piston at the top of its stroke Ambient Temperature At very cold ambient temperatures 30 F 34 C or below there may be insufficient vapor pressure in the fuel tank to sup ply fuel to the converter regulator resulting in no start or hard starting Another condition which may prevent starting in cold weather involves over priming If this condition is suspected attempt to start the engine with the primer disc
46. shing assy fuel inlet B3 25 R1 41 8 2 AF4 22 Fuel inlet 38 flare X 38 NPT 90 w retainer optional NOTES In colder climates the Model L vaporization capacity will be reduced by 20 dur ing WOT operation Due to lower rate of water flow in industrial application Model L is rated at 200 H P in these installations Indicates repair kit components Repair Kits Part Description ea E 32 E RK L z Sine 3 o amp s GAS EQUIPMENT COMPANY Inc 363 Carburetors Tvvo Stage Converters Impco Model E amp PE Series 325 H P LP Gas 200 H P Ratings Ref Part Deseription Screen atmosphere vent Screw 10 24 x 58 SEMS 8 Cover assy secondary 3 notes C1 22 P1 10 S2 21 W1 27 S7 4 mm Diaphragm assy secondary hydrin 5 D1 14 1 P2 16 2 L2 1 R2 3 2 Diaphragm assy secondary hydrin D1 23 P2 16 2 L2 1 R2 3 2 L A386 Lesen Seat secondary new 52 22 Spring secondary regulator blue standard 2 23 Spring secondary regulator orange optional P3 13 Plug 1 8 pipe hex head 2 S1 59 Screw 8 32 x 58 SEMS 5 ors G1 118 Gasket water passage Screw 1 4 20 x 58 SEMS 2 P1 34 Pin primary valve G1 119 Gasket vaporizing chamber AC1 64 Cover vaporizing chamber C1 64 J1 17 Screw 10 24 x 58 SEMS 9 SCH S4 23 Seat support primary NOTE 1 Two va

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