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1. 15 11 3 Coolant Temperature 5 eee he 15 12 4 Manifold Air Temperature Sensor 15 125 KNOCK SENSO eo 15 12 6 Wide Band Oxygen Sensor W B02 oR 15 eee 15 amare 15 1279 1 AN 15 T OPINI OO UNS 15 TOE AIAG ae al BL eet eee Sel lL de 15 13 2 1 16 1323 Adapter 16 TAO OOS CVV 16 520 Man Power 17 16 0 System WIN 17 161 Small Cap Computer Controlled GM
2. H _ wys YAS pp _____ _ 220 knock ineur BEIGE BLUE 2 a CRANK INPUT DIG amp IPU PURPLE 2ga 71711 FUEL PRESSURE 22 At p17 J 204 A321 2 18 TPS 0 1 INJECTOR D PURPLE _ INPUTS OUTPUTS _ DESCRIPTION COLOR _ WIRE GAUGE PIN 20 ___________ 2294 89 PWM 3 OUT G P ____ GREYIBLACK 20 OUT H P GREYIRED 20 CYLINDER 2254 __ 4 2o __ ESTO CYLINDER 6 294 817 ESTS CYLINDER 8 22 Be BLACK 20 ga ______ __ __0 __ 849 __ _____________ 2 8 3 2 822 5 5 7254 __ 2 EST 7 CYLINDER 7 Oo 22ga BAA INJECTORB_ nga 25 INJECTORS 271R961A HOLLEY 4BBL KNOCK Y 7 TPS TBI HARNESS SH ___________ CTS ay IGNITION 4 senam
3. 17 16 2 NON ECU Controlled Timing Applications GM Non ECU Controlled Large Cap 18 1623 Magnetic Crank eile ewes 20 164 CCl Crane IC KU 21 17 0 Programmable mpu 22 TAT 5 22 2S ee en eee ee 23 1 0 INTRODUCTION Holley Performance Products has written this manual for the installation of the HP EFI TBI fuel injection system This manual contains the information necessary for the hardware installation Please read all the WARNINGS NOTES and TIPS as they contain valuable information that can save you time and money It is our intent to provide the best possible products for our customer products that perform properly and satisfy your expectations Should you need information or parts assistance please contact our technical service department at 1 270 781 9741 Monday through Friday 8 a m to 5 p m Central Time By using this number you may obtain any information and or parts assistance that you may require Please have the part number of the product you purchased when you call NOTE This manual is for the hardware installation of a Holley Throttle Body Fuel Injection System and instructions specific to it Instructions on wiring harness installat
4. IGNITION SIGNAL FLOW CHART CRANK AFTERMARKET WHICH FIRES TRIGGER SIGNAL SENDS SIGNAL IGNITION BOX SIGNAL IGNITION COIL SPARK PLUG TO Figure 12 16 4 Hall Effect Crank Pickup The follow diagrams are for running a hall effect pickup either a crank trigger or a distributor It is recommended to use PN 558 306 which will contain wiring for both the crank and cam sensor inputs It is important that properly installed shielded and grounded cable is used when using a hall effect input PN 558 306 comes with the proper cabling It must be installed properly as well Make sure that the shield is properly grounded which requires it being grounded at the ECU with that ground maintained through the ignition adapter connection HOLLEY EFI TO AFTERMARKET IGNITION USING HALL EFFECT PICK UP NOTE ROUTE THESE WIRES AWAY FROM ALL OTHERS TO AVOID INTERFERENCE ORANGE CD COIL CRANK TRIGGER CRANK TRIGGER ECU CONTROLLING IGNITION TIMING A CRANK INPUT CAM INPUT BYPASS OUT GROUND D CHASSIS GROUND SWITCHED 12V PICKUP SENSOR F NOT USED CONNECT TO LOOSE WHITE WIRE IN MAIN HARNESS G GROUND VIOLET AND GREEN NOT USED ORANGE AND BLACK N HOLLEY 800 SERIES IGNITION MSD 6 SERIES IGNITION available CRANE HI 6 IGNITION et no longer TI IGNITION RED SWITCHED PO
5. Connector Function ____ Coil Input o Fuel Pump Out 12v 10 2 F52THG _________ 4 F5G _________ A5 A6 A7 WB1 2 ___________ A8 A9 A10 A11 Manifold Air Temp Input A12 ___ Input 1 F52THG A13 Inout 3 F5G 14 Cam Crank Ground 15 16 17 WB1 VS IP A18 Sensor Ground 19 20 Knock 2 Input A22 Cam Sync Input Ignition Bypass Output 1 2 4 24 Sensor 5v o NOT USED EST Spout Output Knock 1 Input Crank Speed Input Fuel Pressure Input CAN Hi WB1 IP WB 12 0 Primary Sensors Connection P1B Connector Function _______ 1 5 Injector G Output B7 B8 IAC B Hi B10 B11 B12 B13 B14 B15 B16 B2 B3 B4 B17 B18 B19 B20 B21 B EST 5 Output Cylinder 5 EST 7 Output Cylinder 7 Injector C Output Injector B Output 22 23 24 B25 B26 These sections are an overview of all the connections that must be completed on the Main Harness The Main Harness is the primary harness that supports all the primary engine sensors fuel and ignition for 8 cylinder engines the 1 wideband oxygen sensor and the four programmable input and output channels There are two connectors for this harness designated as 1 pin designations below that start with A and 1 pin designations below that start with The following descriptions i
6. s FUSE M ST AN INPUTS OUTPUTS lt e a i LOOSE LEADS m MAP DESCRIPTION LENGTH COLOR LOOSE LEAD 12V BATTERY DESCRIPTION LENGTH COLOR 12V FUEL PUMP GREEN 12V SWITCHED RED WHITE POINTS OUTPUT WHITE IGNITION GROUND BLACK WBO2 COIL YELLOW FUEL a 3 4 51 ER 7131
7. NOTE See section 16 0 for applications and diagrams on wiring most ignition systems 14 0 Loose Wires The following loose wires in the main wiring harness should be connected as follows on all systems 12V Switched Color Red White Should be connected to a clean 12 volt power source Power source should only be active when the ignition is on Make sure source has power when engine is cranking as well Not all sources apply power when the ignition switch is in cranking position 12V Battery Color Red Should be connected directly to the battery There is a fuse holder attached that should contain a 20A rated fuse This powers the fuel pump and fuel injectors 12V Fuel Pump Color Green Used to directly power a fuel pump 12 volt Fully terminated harnesses utilize a relay to supply this power 14 gauge wire is used Due to this it is not recommended for pumps that draw over 10 12 Amps to use this wire For high current pumps use this wire to trigger a Separate relay and use larger gauge wire to feed the pump 10 gauge is recommended 16 Points Output Color White Used to trigger a CD ignition box See the ignition wiring section for detailed wiring Ignition DIS Chassis Ground Color Black Connect to a ground point that has excellent connectivity with both the engine and the battery Coil Color Yellow Used for an RPM input signal when not controlling timing NOT runn
8. eMac 8 9 2 TONE COMME Cll ONS dw sed tls 8 9 3 MAP Sensor Installation and Vacuum Line 9 94 Fuel Pump Wel Filter Installation Gen tee coi Sora E 9 IMG US Fall AU OM 11 9 6 Owden SENSOF INSTA ANON lt e 11 96 1 Oxygen Sensor Mounting 2 12 ic 13 10 1 Important Wining DO S DONS a 13 0226 WC OMMECIO S PINOUE saint 13 a eer eee er eT er ee fae eee eaters eer ere 14 12 0 Piman SCNSOrS GONMECHON cated eae oe ence 14 12 5 Throttle Postion Sensor TRS ea 15 12 2 Manifold Air Pressure Sensor MAP irren
9. I IZIN NDN EFI 550 411 900 CFM 75 lb hr injectors up to 525 HP 550 412 900 CFM 85 lb hr injectors up to 600 HP NOTE HP throttle body systems do not include fuel pump TBI HARDWARE INSTALLATION MANUAL 199R10507 NOTE These instructions must be read and fully understood before beginning installation If this manual is not fully understood installation should not be attempted Failure to follow these instructions including the pictures may result in subsequent system failure 1 TABLE OF CONTENTS MSOs UNE OO IO ___ ____________ __ __ 3 20 CHOOSING THE RIGHT SYSTEM 2 a 3 30 WARNINGS NOTES AND NOTICES 4 ZO PAR FS IDENTIFICATION a concn 4 5 0 ADDITIONAL ITEMS REQUIRED FOR INSTALLATION 7 6 0 TOOLS REQUIRED FOR INSTALLATION 7 7 0 COOLANT TEMPERATURE SENSOR INSTALLATION 0 0ccccccccccceeeeeeceeeeeesssseeceeeceeeeeseesesaaeessssesseeeceeeeeeesessssaaagaaaeeseeees 7 8 0 REMOVAL OF EXISTING FUEL SYSTEM E 7 9 0 AIP EPL BIPSY S TAL EA TION ev 8
10. 12 must be installed in a coolant passage in either the intake manifold or cylinder head The sensor has 3 8 NPT threads If only gt NPT port is available an adapter will have to be used It is best to drain the some of the coolant before the sensor is installed 8 0 REMOVAL OF EXISTING FUEL SYSTEM 1 Disconnect the battery and remove the air cleaner 2 Before disconnecting any vacuum hoses it is a good idea to sketch out the vacuum hose routing Using masking tape and a permanent marker mark all the vacuum hoses vacuum sources and ports before removing the old fuel delivery system 3 Remove and discard the fuel line that connects the fuel delivery system from the fuel pump This will not be needed in the installation 4 Disconnect and plug the inlet fuel line that runs from the gas tank to the fuel pump This will prevent fuel spillage and foreign matter or dirt from entering the fuel line DANGER Before disconnecting or removing fuel lines ensure the engine is cold Do not smoke Extinguish all open flames An open flame spark or extreme heat near gasoline can result in a fire or explosion causing property damage serious injury and or death 5 The fuel delivery system can now be removed Holley recommends removing the mechanical fuel pump if so equipped and blocking off the fuel pump mount using the provided fuel pump block off plate The HP EFI system kit includes a block off plate that will fit small and big block
11. 12v or High Side input This input will be triggered when system voltage is applied Minimum triggering voltage is 4 5v Do not exceed 24 Wiring Connect up to any voltage source that is desired to trigger this input 2 Switched Ground Low Side input This input will be triggered when a ground is applied Wiring Connect up to any ground source that is desired to trigger this input 3 5 0 5 volt sensor input Any 0 5 volt sensor input such as a TPS MAP sensor pressure transducer many others Wiring Wire the signal wire from the 0 5v sensor used into the appropriate pin Any 0 5v sensor requires 5v reference voltage and a sensor ground On an HP the user must tie into the existing 5v reference and Sensor Ground lines which go to any of the 5v sensor such as MAP TPS etc These wires are as follows Connector Sensor 5v Reference Voltage Pin Sensor Ground Pin P1A A26 Orange A18 Black White lt is acceptable to have multiple sensors share the same 5v and ground reference lines Be sure to solder heat shrink etc wires properly as poor connections will cause for inaccurate or faulty sensor readings Do not use 5v reference or ground sources from other controllers or power supplies to support the sensor or sensor accuracy may be compromised 4 2 0 20 volt sensor input Any 0 20 volt sensor input Wiring Connect to desired voltage input 5 Ther
12. 558 303 and 558 306 come with the proper cabling It must be installed properly as well Make sure that the shield is properly grounded which requires it being grounded at the ECU with that ground maintained through the ignition adapter connection Note The user must supply the proper terminals connectors for the crank and cam sensors they are using HOLLEY EFI TO AFTERMARKET IGNITION USING MAGNETIC PICK UP CRANK TRIGGER ECU CONTROLLING IGNITION TIMING CRANK TRIGGER TYPE POSITIVE NEGATIVE CRANK TRIGGER FIREPOWER GREY OR ORANGE MOROSO e SEE LISTED WIRE CODES FOR YOUR APPLICATION VIOLET on 558 303 YELLOW on 558 306 CONNECT TO LOOSE WHITE WIRE IN MAIN HARNESS G IPU GROUND PICKUP SENSOR HARNESS P N 558 303 MAGNETIC PICK UP or 558 306 UNIVERSAL H EST SPOUT OUT J SHIELD CAM HEAT SHRINK BARE SHIELD WIRE K SHIELD CRANK WHITE POINTS TRIGGER VIOLET AND GREEN NOTE ROUTE THESE WIRES NOT USED AWAY FROM ALL OTHERS TO AVOID INTERFERENCE ORANGE AND BLACK ORANGE BLACK j HOLLEY 800 SERIES IGNITION MSD 6 SERIES IGNITION CRANE HI 6 IGNITION IGNITION RED SWITCHED POWER SWITCH 14 BROWN CRANE GREEN HEAVY BLACK SLE CEES RS z A N 5 CD COIL GREEN TO CHASSIS GROUND
13. CFM 72 75 lb hr requires purchase of 4 1 522 80 Fuel Injector 900 CFM 85 lb hr requires purchase 4 1 522 43 Fuel Pressure Regulator Diaphragm 1 512 1 Idle Air Control Motor 1 543 105 Throttle Position Sensor TPS 1 543 29 Optional Parts Small Cap GM Ignition Adapter 1 558 304 Ford Ignition Adapter 1 538 305 Item 3 Item 10 OO 13 14 Item 15 Item 12 16 19 Pre Installed in Harness Item 21 24 Item 31 33 34 5 0 ADDITIONAL ITEMS REQUIRED FOR INSTALLATION e 3 8 fuel hose must meet SAE J30 e 5 16 fuel hose must meet SAE J30 e 5 16 steel fuel line must meet SAE J526 e 0 30 psi fuel gauge e Tee fitting for fuel gauge In addition to the above list the engine must be equipped with a four barrel intake manifold and the vehicle must be in good operating condition 6 0 TOOLS REQUIRED FOR INSTALLATION e Standard wrench set e Small blade screwdriver e 5 32 Allen wrench e Medium blade screwdriver e 2 Phillips screwdriver e Digital Volt Ohm meter e Drill and assorted bit sizes e Hole saw 2 e Terminal crimping tool e Utility knife e Factory Service Manual for your vehicle e Windows laptop XP Vista 7 e An assistant is necessary for some installation and adjustment procedures and should be present for safety reasons 7 0 COOLANT TEMPERATURE SENSOR INSTALLATION The coolant temperature sensor item
14. device has 2 wires connector the other side of the device to a voltage source 23 NENTS MiFWNREVsSVisNr SY Holley Performance Products 1801 Russellville Road Bowling Green KY 42101 Technical Service 1 270 781 9741 Fax 1 270 781 9772 For online help please refer to the Technical Information section of our website www holley com 199R10507 wf Date 6 23 10 271R961A HOLLEY EFI 4BBL TBI HARNESS 12V SWITCHED FUSE 12V BATTERY GREEN 14 ga FUEL PUMP RED FAT BIC DESCRIPTION COLOR WREGAUGE PNE 1 4 a vw m FUEL PUMP RELAY OUT _____ _____ 2202 relay 22 HHH IHH 2 we 2e __ H BLACK 22 weere 26 22 LOOSE PONTS OUTPUT waite sa T na __ HHHH SWITCHED eow wa eH IHH 1 MATINPUT a HH 8 INPUT esana 22 H WBO2 IPUGROUND 2a m p Sauce wesa 2a Lette tt tt a A es a 2 _____ 7 2 fy AlcooLaNTTEMPIN BROWN 2208 HHHH OLPRESSURE ge F
15. ignition adapter harness with a single YELLOW BLACK wire that directly connects to the ignition adapter on the main harness If you have this adapter use it to connect the YELLOW BLACK wire into the tach output of the CD ignition box 2 If your kit contains an distributor ignition adapter harness 4 wires you can cut and splice into the YELLOW BLACK wire in it This saves you from having to modify the main harness 3 If you have no ignition adapter harness you can splice into the purple wire in the main harness If splicing is done make 100 certain that this is a very solid connection Solder and heat shrink is highly recommended This supplies the engine speed signal to the ECU and if the connection is not solid the engine will not run properly HOLLEY EFI GM USING MECHANICAL AND VACUUM ADVANCE 4 PIN MODULE DISTRIBUTOR ECU NOT CONTROLLING IGNITION TIMING YELLOW CONNECT TO YELLOW COIL WIRE ON EFI HARNESS NOTE ON VEHICLES WITHOUT A FACTORY TACHOMETER CONNECT THE HOLLEY EFI S YELLOW WIRE DIRECTLY TO THE DISTRIBUTOR TERMINAL MARKED USING A 1 4 FEMALE SPADE CONNECTOR puch BROWN g FACTORY HARNESS SOLDER AND HEAT SHRINK DISTRIBUTOR BROWN FACTORY HARNESS TO TACHOMETER RED SWITCHED POWER IGNITION 1 SWITCH NOTE ROUTE THESE WIRES AWAY FROM ALL OTHERS TO AVOID INTERFERENCE ORANGE Figure 10 HOLLEY EFI TO AFTERMARKET IGNITION USING MAGNETIC
16. occur Connect the 2 connector to the WBO2 sensor which should be installed in the exhaust system 12 7 Fuel Pressure Fuel A fuel pressure transducer connector 15 pre installed in the main harness The system is plug and play configured for a Holley 100 PSI pressure transducer can be purchased under PN 554 102 A different 0 5 transducer can be used but the calibration must be set up as a custom sensor in the software If these are not connected to a pressure transducer the Fuel and Oil Pressure will read LOW Err in the data monitor This will not cause any issues NOTE Connect to the transducer if installed 12 8 Oil Pressure Oil An oil pressure transducer connector is pre installed in the main harness The system is plug and play configured for a Holley 100 PSI pressure transducer can be purchased under 554 102 A different 0 5 transducer can be used but the calibration must be set up as a custom sensor in the software If these are not connected to a pressure transducer the Fuel and Oil Pressure will read LOW Err the data monitor This will not cause any issues NOTE Connect to the transducer if installed 12 9 CANbus CAN All harnesses have a CANbus communications connector This is used to communicate with CANbus devices such as the Avenger Handheld tuning module the 5 7 Touch Screen LCD If these devices any other CANbus device is not being used there is no need to do anyt
17. this pin will serve as the ignition bypass output Pin B A14 IPU Ground Pin C Chassis Ground Pin 10 Switched 12v Pin A27 NOT USED Pin F 14 Ground Pin A28 EST Spout Output Pin H A14 Shield Ground Pin J A14 Shield Ground Pin NOTE Thecrank and cam input wiring in both the main harness and adapter harnesses use a shielded grounded cable The shield is grounded at the ECU end You do not ground both end of shielded grounded cable It is always recommended to use shield grounded cable to protect the integrity of the crank or cam sensor input signals This is especially important when using a magnetic pickup A hall effect sensor is much less susceptible to noise interference and is always the recommended sensor type to use Holley offers the following ignition adapter harnesses e 558 303 Magnetic Pickup Harness Intended for magnetic pickups Either crank trigger or distributor mounted Does not contain cam sync wiring e 558 304 HEI Connects to small GM computer controlled distributor e 558 305 Ford TFI Connects to a Ford TFI Distributor e 558 306 Universal Unterminated Ignition Harness Contains ignition adapter connector all wiring to connect to any crank and cam sensors pins A K Also contains shielded grounded cable for crank and cam sensor inputs The user must supply terminals and connectors to plug into their chosen sensors
18. to add anti seize to the threads to aid in removal 3 vehicles equipped with AIR pump the oxygen sensor must be mounted before the AIR injection into the exhaust or the AIR pump must be disconnected Holley recommends that if the AIR is injected into both exhaust manifolds mount the oxygen sensor into the pipe immediately after the exhaust manifold Disconnect the AIR pump tube from the exhaust manifold and plug both ends Check with local ordinances for the legality of this procedure in your area WARNING Failure to disconnect the AIR pump or locating the oxygen sensor downstream from AIR injection will result in an extremely rich mixture which could cause driveability problems and severe engine damage WARNING It is important that the distribution ring is properly installed and fastened to the throttle body Failure to do so will cause an inadequate seal between the throttle body and air cleaner and may be a fire hazard in the event of a backfire Fire hazard can result in property damage serious injury and or death 10 0 Wiring The following overviews how to properly install the wiring harnesses for this system 10 1 Important Wiring Do s and Don ts An EFI system depends heavily on being supplied a clean and constant voltage source The grounds of an electrical system are just as important as the power side ECU s both contain multiple processing devices that require clean power and ground sources The wiring
19. 0 TION MSD 6 SERIES IGNI BROWN CRANE GREEN i PN 558 304 HEAVY BLACK TOLLEY ADAPTER CRANK INPUT BLACK 16 AWG Tuy CAM INPUT BYPASS YELLOWBLACK BLUE WHITE CRANE 8 IGNITION GREEN TO CHASSIS GROUND gt 9 CD COIL 16 2 NON ECU Controlled Timing Applications Non ECU Controlled Large Cap PINK OR RED IPU GROUND CHASSIS GROUND BATTERY E SWITCHED 12V F NOT USED G IPU GROUND DISTRIBUTOR EST SPOUT OUT TS HOLLEY PIN 890 160 J SHIELD MSD P N 8368 K SHIELD CRANK Figure 9 To connect to a distributor that has mechanical advance and is not controlled by the ECU ex GM large cap HEI non computer controlled distributor refer to the following diagrams e lf NOT using CD ignition box connect the loose YELLOW NOT yellow black wire in the harness to the negative side of the ignition coil e If using a CD ignition box connect the purple crank input wire located the ignition adapter harness to the tach out in the ignition box This wire is located in Pin A of the 10 pin ignition adapter in the harness Do NOT use the purple wire in pin B this is for the camshaft sensor input The following shows three options in order of preference 1 Some kits come with a 10 pin
20. Chevrolet and Chrysler engines If the block off plate does not fit your engine a block off plate may have to be purchased from a local performance parts supplier 6 If required replace the intake manifold at this time Proceed to step seven if this is not required 4 BARREL STOCK OR AFTERMARKET SQUARE FLANGE INTAKE MANIFOLD IS REQUIRED FOR THE INSTALLATION OF THE HOLLEY HP EFI TBI system 7 Place clean shop towels or rags into the manifold opening to prevent dirt or debris from entering the engine Keep exposed ends of the vacuum and fuel lines free from dirt WARNING Failure to cover the intake opening with a clean towel could result in dirt or debris entering the engine Dirt or debris in the induction system can cause engine damage which may necessitate in a complete engine overhaul 8 Remove all traces of the old gasket material from the TBI mounting flange DO NOT gouge the intake manifold sealing surface during removal of old gasket material Failure to remove all traces of the old gasket material will result in vacuum leaks that will be difficult to detect later Sealing flanges must be clean and dry before installation 9 Remove the shop towels from the intake and vacuum out the intake channel to ensure no dirt or debris is left in the intake system Place a shop towel over the entire intake opening until you are ready to install the new HP EFI TBI 9 0 HP EFI TBI SYSTEM INSTALLATION 9 1 Throttle Body NOTE A 4 barrel intake
21. ING Ensure both filters are installed in the proper direction A flow direction arrow is stamped on the side of the filter to indicate the direction of fuel flow Failure to do so will result system malfunction DANGER Take precautions to ensure all fuel line routings are away from heat sources such as the engine or exhaust system A fire or explosion hazard could cause property damage serious injury and or death 6 Plumbing must now be installed to connect the fuel tank to the filters pump and TBI unit It is recommended to use steel hard line or stainless braided hose with AN fittings If AN plumbing is used the appropriate fittings must be purchased for the pump and TBI unit Filters must have AN style fittings as well The thread in the inlet and outlet fittings of the TBI unit is NPT Air Temperature Sensor P blue and black wires Pressure Port Plug Return Side Return Line 7 3 8 line should be used on the feed pressure to Fuel Tank side of the system the filters included are designed for 3 8 line If using steel line rubber hose rated for use with fuel injection can be used to connect the steel line to the pump and filters You should not connect a rubber hose directly to a steel line unless the init eg end of the line has a bead nipple or barb that Puri retains the hose similar to the ends of the fuel filters If the steel line is just cut off purchase a comp
22. PICK UP DISTRIBUTOR ECU NOT CONTROLLING IGNITION TIMING DISTRIBUTOR DISTRIBUTOR TYPE POSITIVE NEGATIVE SEE LISTED WIRE CODES FOR YOUR APPLICATION WHITE NOT USED VIOLET AND GREEN ORANGE AND BLACK gion RED SWITCHED POWER BLACK GREEN CHASSIS GROUND CRANE GREEN HOLLEY 800 SERIES IGNITION available IP MSD 6 SERIES IGNITION CRANE HI 6 IGNITION 2 HEAVY BLACK Connect YELLOW BLACK wire on ignition adapter to CD box TACH OUT or splice into purple wire on main harness PIN A on ignition adapter BATTERY YELLOW BLACK CRANK INPUT E 9 O IPU GROUND D CHASSIS GROUND CD COIL E SWITCHED 12V IGNITION ADAPTER _NOTUSED G IPU GROUND EST SPOUT OUT J SHIELD CAM K SHIELD CRANK TACHOMETER Figure 11 19 16 3 Magnetic Crank Pickup The follow diagrams are for running a magnetic pickup either a crank trigger or a distributor To run just a magnetic pickup crank input and no camshaft input 558 303 should be purchased If a cam sync input will be used as well it is recommended to use PN 558 306 which will contain wiring for both the crank and cam sensor inputs It is critical that properly installed shielded and grounded cable is used when using a magnetic pickup or it is likely that EMI will disturb the crankshaft signal Both PN
23. U Connectors and Pinout Battery Power Connection The HP ECU has a main battery power and ground connector on the right side of the ECU The bottom position Terminal A is the ground The upper position Terminal B is the positive terminal Always use the fused power cable with the proper connectors supplied by Holley only USB Communications Connector HP ECU s use a standard USB cable for Laptop communications Looking at the front the connector is at the far left side This connection is a common mini USB connector typically used for digital cameras and other devices Holley offers a USB cable with a sealed connector PN 558 409 for applications where the USB cable will be plugged in and the ECU is mounted in a dirty environment HP ECU The HP ECU has two main connectors e The first connector next to the USB connector is the connector 34 pin This connector is primarily an Input connector It contains all the sensor inputs and wide band oxygen sensor control e P1B The second connector is the P1B connector 26 pin This connector is the output connector It has 8 injector outputs 8 DIS ignition outputs 4 IAC outputs and 4 user programmable outputs BAROMETRIC PRESSURE SENSOR no connection needed Figure 7 13 11 1 Pinout The following is a pinout of the HP ECU connectors The P1A and P1B connectors and pinout are identical for the HP and Dominator ECU s
24. WER a CS SWITCH GREEN TO CHASSIS GROUND a BROWN P E A CRANE GREEN E HEAVY BLACK BATTERY IGNITION SIGNAL FLOW CHART WHICH FIRES SPARK PLUG Figure 13 21 17 0 Programmable Inputs and Outputs Programmable input and outputs are intended to be any input or output that is created by the user when a Global Folder is configured Once configured they must be assigned a to a specific pin location on the Pin Map and then physically wired per the assigned location The HP ECU has an Input Output connect on the main harness This is an 8 pin metripak connector Programmable inputs and outputs can be connected into this connector PN 558 400 is a harness that plugs into this connector If you do not want to purchase this harness use alternative methods to connect to these 8 wires This connector is as follows The functions are described below Input Output Connector Pin ECU Pin Wire Color Function A P1 A12 White Blue F52THG B P1 A3 White Red F52THG C P1 A13 White Black F5G D P1 A4 White Green F5G E P1 B12 Grey Yellow P H F P1 B11 Grey Red P H G P1 B10 Grey Black P G H P1 B3 Grey Green P G 17 1 Inputs There are six types of inputs that can be configured The following lists them and reviews wiring recommendations The designation on the Pin Map Inputs is given first then a description 1 Switched
25. be slightly after all the cylinders merge 11 9 6 1 Oxygen Sensor Mounting Procedure NOTE Someone with experience in welding exhaust systems should install the oxygen sensor boss Any competent exhaust shop will be able to perform this task at a minimum cost WARNING Use of leaded fuel will degrade an oxygen sensor Prolonged use is not recommended unless periodic replacement is performed WARNING Use of some silicone sealers will destroy the oxygen sensor used with this product Ensure the RTV silicone sealant you use is compatible with oxygen sensor vehicles This information should be found on the RTV package 1 Locate a position for the oxygen sensor as close to the engine as possible If your vehicle has catalytic converters the oxygen sensor MUST be located between the engine and the catalytic converters Figure 6 NOTE The oxygen sensor should be mounted in such a way that the condensation in the exhaust tubing will not enter the sensor Mount the sensor in the upper half of the exhaust tubing with the angle x shown above being greater than 10 The picture above indicates that the sensor can be mounted on either side of the exhaust tubing 2 Drill 7 8 hole in the location picked the sensor Weld the threaded boss into the 7 8 hole Weld all the way around the boss to insure a leak proof connection Install the oxygen sensor into the threaded boss and tighten securely Itis good idea
26. ensor itself 2 Install vacuum hoses to the appropriate port on the throttle body Use the diagrams made during removal of the existing fuel system to locate the correct port The vacuum ports of the throttle body are e Fil labeled in Figure 2 Manifold Vacuum 9 4 Fuel Pump Fuel Line and Filter Installation NOTE HP Throttle Body systems DO NOT include a fuel pump The installer can use their in tank or in line pump of choice Holley offers in line and in tank EFI fuel pumps P N 12 920 is an in Figure 2 line pump rated for up to 600 650 HP naturally aspirated engines It is the recommended in line pump for Holley 466 systems NOTE If you have dual fuel tanks you must purchase Holley PN 534 38 The following section covers the installation of an in line pump such as Holley PN 12 920 Holley includes both and post filter with the HP TBI system Both of these filters have barbed ends and are designed to connect to an EFI pressure rated rubber hose They are not designed for AN style plumbing 1 Do not mount the fuel pump higher than the lowest point of the fuel tank 2 Make sure fuel tank is properly vented DANGER Never get under a vehicle supported only by a jack Serious injury or death can result from vehicles falling off of jacks Before working underneath a vehicle support it solidly with jack stands 3 Mount the electric fuel pump as close to the fuel tank outlet as possib
27. er torque is 5 7 ft lbs WARNING Over tightening the TBI manifold flange hold down nuts may result in a warped or cracked throttle body The TBI hold down nuts should be tightened down progressively in a criss cross pattern to 5 7 ft Ibs to prevent leaks and avoid causing damage to the throttle body A TBI that has been damaged due to negligence of the owner will void the warranty 9 2 Throttle Connections 1 Measure the length of the throttle lever arm on the carburetor removed from the vehicle Compare the length of the existing throttle lever arm with the one on the HP EFI throttle body If the two throttle lever arms are similar in length within 1 2 of each other the throttle lever arm hole on the HP EFI throttle body can be used without the extension bracket Use the throttle lever arm extension bracket if the old throttle lever arm is significantly longer than the new throttle lever arm Before installation of the bracket check the diameter of the throttle cable stud Some systems may use a 1 4 stud that will require drilling of the appropriate hole in the extension bracket to a 1 4 diameter Attach the extension bracket using two fillister head screws as shown in Figure 1 The extension lever length can be adjusted using the four sets of holes 2 Attach throttle linkage and have an assistant get the vehicle and fully actuate the throttle controls Make the necessary adjustments to the throttle linkage to ensure tha
28. harnesses for them must be installed in such a manner that they are separated from dirty power and ground sources DO S e Install the main power and ground directly to the battery e Keep sensor wiring away from high voltage or noisy dirty components and wiring especially secondary ignition wiring ignition boxes and associated wiring e Use shielded grounded cable that is supplied for wiring crankshaft and camshaft signals e Properly solder and heat shrink any wire connections e It is critical that the engine has a proper ground connection to the battery and chassis DON TS e NEVER run high voltage or noisy dirty wires in parallel together with any EFI sensor wiring If wires need to cross try to do so at an angle Do not let Crank and Cam signal wiring near spark plugs and coil wires Do not run non shielded grounded wire for crankshaft and camshaft signals especially magnetic pickups Do not run the USB Communications cable near or with any noisy wires Do not exceed the current limits provided for the various outputs If current levels exceed these use the appropriate relay or solenoid drivers Do not use improper crimping tools Don t use things like etc Use solder and heat shrink It is never recommended to splice share signal wires such as TPS etc between different electronic control units Don t wire items that require clean ground or power to the same points 11 0 EC
29. hing with this connector A24 CAN Lo Pin B A32 CAN Hi Pin A 13 0 Primary Outputs 13 1 Idle Air Control IAC Connect to the idle air control motor which is installed in the throttle body 15 13 2 Fuel Injector Outputs Injectors All terminated harnesses have a fuel injector connector Various fuel injector harnesses plug into this connector It is essential these harnesses are used so that injector firing sequence is maintained Note that for engines with different firing orders you do NOT change these pins The engine s firing order is input in the software itself V8 harnesses offered by Holley are labeled for GM Ford and Chrysler engines Each injector harness has the engine cylinder number labeled on each injector connector Connect each injector on the appropriate cylinder 13 3 Ignition Adapter Ignition The Ignition Adapter connector contains all the wires needed to connect to adapter harnesses offered by Holley for various ignition systems and crank and cam sensor The only ignition related wiring that is NOT contained on this connector is individual coil driver outputs for DIS applications The adapter is pinned as follows A30 Crank signal Input Both digital and inductive proper type must be selected in the software Pin A 22 Cam signal Input Ignition Bypass Output Both digital and inductive proper type must be selected in the software NOTE If using a computer controlled GM HEI Distributor
30. ing a Capacitive MSD ignition system See the ignition wiring section 8 0 for detailed wiring WARNING Connecting this wire to the coil of a CD ignition will damage the ECU 15 0 Main Power Harness Holley HP and Dominator ECU s use the same main power cable These wires should be run directly to the battery 10 gauge wire is used The harness comes with a 40 Amp fuse pre installed Do not substitute smaller gauge wires 16 0 Ignition System Wiring Both the HP and Dominator Systems support a wide variety of ignition systems The following schematics show how to wire the most typical systems 16 1 Small Cap Computer Controlled GM To connect to a small cap computer controlled GM HEI ignition adapter harness PN 558 304 is required The following diagrams overview how to wire with and without a CD ignition box HOLLEY EFI GM IGNITION USING COMPUTER CONTROLLED DISTRIBUTOR EXTERNAL COIL ECU CONTROLLING TIMING IGNITION SWITCHED POWER SWITCH INDUCTIVE COIL P N 558 304 C WHITE HOLLEY ADAPTER PINK OR RED A INPUT BLACK 16 AWG BLUE WHITE D CHASSIS D CHASSISGROUND es st DISTRIBUTOR HOLLEY P N 890 160 291298 Figure 8 17 SWITCHED POWER NOTE OU HESE WIRES AWAY FROM ALL OTHERS TO AVOID INTERFERENCE ORANGE BLACK HARNESS NOT SUPPLIED eect HOLLEY 200 SERIES IGNITION 02
31. ing shielded grounded cable connect the shield ground wire to the ECU only best to connect it to IPU ground 17 2 Outputs All PWM Pulse Width Modulated and switched outputs are rated at a maximum of 2A If a device will draw more than 2 some type or relay must be used If the output is PWM not use a switching relay but rather a solid state type relay designed to be pulse width modulated There are four types of outputs that can be configured The following lists them and reviews wiring recommendations The designation on the Pin Map Outputs is given first then a description 1 Switched 12v or High Side output will output system voltage level Wiring Connect the pin to the device to be triggered 2 Ground or Low Side output will output a ground trigger Wiring Connect the pin to the device to be triggered 3 P 12v Pulse Width Modulated output Outputs high side pulse width modulated output to control items such as a progressive nitrous solenoid or a PWM IAC will output system voltage level Wiring Connect the pin to the device to be triggered A PWM device has 2 wires connector the other side of the device to ground 4 P Ground Pulse Width Modulated output Outputs a low side pulse width modulated output to control items such as a progressive nitrous solenoid or a PWM IAC Wiring Connect the pin to the device to be triggered A PWM
32. ion software operation sensor operation and tuning is contained on the disc supplied with the HP systems NOTE laptop computer with a USB port is required for the installation and tuning of the HP system WARNING The HP EFI systems consist of a number of sophisticated components Failure of any one component does not constitute nor does it justify warranty of the complete system Individual service items are available for replacement of components If assistance is required or if you need further warranty clarification you can call Holley Technical Service at the number shown above WARNING To preserve warranty these instructions must be read and followed thoroughly and completely before and during installation It is important that you become familiar with the parts and the installation of the HP EFI system before you begin Failure to read and understand these instructions could result in damage to HP EFI components that not covered by the warranty and could result in serious personal injury and property damage WARNING The oxygen sensor in this kit is recommended for use with ONLY unleaded fuel Use of leaded fuels will degrade the oxygen sensor and will result in incorrect exhaust gas oxygen readings and improper fuel delivery Failure to follow these directions does not constitute the right to a warranty claim WARNING Failure to follow all of the above will result in an improper installation which may lead to personal inju
33. is required for the installation of the Holley HP EFI TBI system NOTE Some GM and Chrysler engines require the use of a manifold adapter Holley Part Number 17 6 This adapts the spread bore carburetor manifold to the Holley square flange 1 Install the heat spacer between the manifold and the 4 barrel throttle body injection unit Check for sufficient thread engagement of the throttle body hold down studs and nuts It may be necessary to purchase and install longer studs in the manifold for proper nut engagement Gasket sealant may be used to ensure that no vacuum leaks occur NOTE If using a heat spacer the flange gasket 15 not required DANGER Check for proper clearance between engine components such as the distributor coil etc and the throttle body If any interference is found correct the condition before continuing Failure to do so can result in damage to the engine components or the throttle body DANGER Check for proper clearance between the air cleaner and the engine compartment cover hood If any interference is found correct the condition before continuing Failure to do so can result in damage to the compartment cover or engine components 2 Place the throttle body in position over the manifold flange studs with the IAC motor facing the front of the vehicle and the regulator fuel connections towards the rear of the vehicle 3 Tighten the throttle body down in a criss cross pattern being careful not to over tighten Prop
34. it is designed for a 5 16 line If a larger line is used use an appropriate fitting the throttle body The return line must not present a pressure restriction to the return fuel flow There should never be more than approximately 3 PSI of pressure in the return line A line that is too small or has restrictions will cause tuning problems with the system DANGER Do not use the vapor canister lines as a fuel return line Possible fuel leaks may create a fire or explosion hazard causing serious injury or death WARNING Use only approved steel fuel line The return fuel line should enter the fuel tank at the fuel level sending unit flange or at the filler neck The filler neck or sending unit must be removed from the tank to perform this operation DANGER Proper installation of the fuel return line may necessitate complete removal of the fuel tank This work should be done by a fuel tank specialist who regularly does this work and is familiar with safety regulations and precautions necessary to do this work If a person attempts this work who is not familiar with the safety regulations and precautions an explosion hazard may result causing serious injury or death THROTTLE BODY RETURN LINE ELECTRIC FUEL PUMP FILTER WIX 33033 Figure 5 9 6 Oxygen Sensor Installation The oxygen sensor should be mounted at a point where it can read a good average of all the cylinders on one bank This would
35. le with the bracket provided Mounting the fuel pump in this manner will insure that the pump will prime easily and purge fuel vapors in the TBI quickly to ensure faster starts DANGER Take precautions to ensure that all fuel line routings are away from heat sources such as the engine or exhaust pipes A fire or explosion hazard could cause serious injury or death DANGER Ensure that the fuel pump mounting location will not interfere with any under the vehicle components especially at the extreme limits of the suspension travel A fire or explosion hazard could cause serious injury or death Fuel Tank Metal Filter 4 There are two metal filters included with the system The filter marked 33033 MUST be installed between the fuel tank and the fuel pump inlet unless an in tank pump is used The purpose of this filter is to protect the fuel pump from particles of dirt or other foreign material The filter should be installed with the arrow on the filter pointing in the direction of the fuel flow Figure 3 5 The other metal fuel filter that is included with the EFI TBI system should be installed between the electric pump outlet and TBI unit This is a 10 micron EFI filter Position the filter so the fuel hoses can be routed without kinks or sharp bends The filter should be installed with the arrow on the filter pointing in the direction of the fuel flow A clamp is provided to assist with mounting this filter in the kit WARN
36. mistor temperature input Most coolant and air temperature sensors are a 2 wire thermistor design Wiring Connect to one side of the thermistor device Connect the other side of the thermistor device to a Sensor Ground input to the ECU same pins for a 0 5v sensor These pins are as follows Connector Sensor Ground Pin P1A A18 6 Frequency Digital Speed Input Designed for a digital voltage input from a speed rotation sensor A hall effect sensor is the common sensor used Voltage range can be 4 5 to 24 volts Wiring A hall effect sensor has 3 wires Signal Power and Ground Most sensors can be supplied with battery voltage 12v a few require a 5 volt reference Check with the specifications of your specific sensor Although not usually needed with a hall effect sensor it is always advised to use a shielded grounded cable to wire them all three wires can be shielded The following is advised when wiring a hall effect sensor Signal Run the sensor signal wire into the Pin Mapped channel Power Either supply with clean switched power or if it is not used for another purpose you can power from P1B B20 which is a clean 12v power source If the sensor requires 5 volts use 5v reference line Ground It is best to connect to Inductive Magnetic Pickup or Sensor Ground The following pins grounds Connector Sensor Ground Pin P1A 14 Shield Wire If us
37. ndicate the name of the item and the name as labeled on the harness each connector has a label is shown in parenthesis 12 1 Throttle Position Sensor TPS Connect to the TPS which is located on the throttle body 12 2 Manifold Air Pressure Sensor MAP 1 Bar MAP sensor is provided with all Holley systems Connect to the MAP sensor 12 3 Coolant Temperature Sensor CTS Connect to the Coolant Temperature sensor which should have been installed in an engine coolant passage 12 4 Manifold Air Temperature Sensor MAT Connect to the Air Temperature Sensor see Figure 2 Multiport systems will have this installed in the intake manifold and TBI systems will have it installed in the throttle body air inlet 12 5 Knock Sensor Knock Holley EFl systems work with either a one wire or two wire knock sensor Application specific harnesses will have the correct knock sensor connections installed on the harness A Universal harness comes with a 3 pin metripak connector If a knock sensor is added it should be connected into this connector 12 6 Wide Band Oxygen Sensor WB02 Holley EFl systems can work with either a Bosch PN 554 101 or NTK PN 554 100 wide band oxygen sensor These sensors must be purchased from Holley as they are calibrated specifically for use with Holley EFI systems HP EFI systems are sold with the Bosch sensor Make sure you have the proper sensor selected in the Engine Parameters area or sensor damage may
38. ression fitting that a barbed hose end be installed on or use a tool to roll bead nipple on the end of the steel line Install hose clamps on all of these junctions 8 are included in the kit All fuel hoses used must Figure 4 meet SAE J30 performance standards All steel fuel line must meet SAE J526 standards Pressure Port Plug Inlet or Fuel Pump Side 8 The TBI unit has an inlet and an outlet fitting The inlet fitting is designed for a 3 8 hose and is on the drivers side linkage side of the throttle body The return line designed for a 5 16 hose is on the passenger side side with the TPS 9 If you plan to install a fuel pressure gauge do so at this time The 4 systems are designed for an operating pressure of 21PSI Although this is factory pre set it is ideal that it be checked The TBI units have an 1 8 NPT plug on the drivers side that can be used to temporarily install a gauge this location will interfere with the throttle cable on a permanent install to set the pressure Holley also sells a 0 100 PSI pressure transducer PN 554 102 that plugs into the fuel connector on the main harness This sensor can be installed anywhere between the fuel pump and the TBI unit It has a 1 8 NPT male thread 10 If using the existing fuel lines inspect and replace any hose clamps or fuel line showing ANY sign of aging DANGER Failure to use a fuel hose that meets SAE J30 standards could result in f
39. rformed in a well ventilated area Do not smoke or have an open flame present near gasoline vapors or an explosion may result 4 0 PARTS IDENTIFICATION ITEM DESCRIPTION QTY SERVICE PART 1 TBI Assembly 700 CFM 65 lb hr Complete 1 534 172 TBI Assembly 900 72 lb hr Complete 1 534 187 TBI Assembly 900 85 lb hr Complete 1 534 173 2 HP EFI ECU 1 554 113 3 HP EFI Software 1 N A 4 HP TBI Wiring Harness 1 558 100 5 HP Communications Cable 1 N A 6 Metal Fuel Filter 1 562 1 7 Fuel Filter WIX 33033 1 N A 8 Fuel Filter Clamp 1 9 Fuel Pump Block Off Plate Gasket 1 12 813 10 Wide Band Oxygen Sensor 1 554 101 11 Sensor 1 538 24 12 Coolant Temperature Sensor 1 534 2 13 Air Cleaner Adapter 1 17 14 14 Air Cleaner Gasket 1 108 4 15 Flange Gasket 1 108 10 16 Manifold Flange Studs 4 N A 17 Heat Insulator Gasket 1 108 12 18 Oxygen Sensor Weld Ring 1 534 49 19 40 AMP Relay Pre Installed in harness 1 534 26 20 Throttle Bracket 1 N A 21 Throttle and Cruise Control Stud 1 N A 22 Throttle Lever Ball 1 N A 23 Throttle Lever Bracket 1 N A 24 Ford kick down return spring 1 N A 25 Throttle Lever Stud 1 N A 26 Transmission Kickdown Stud 1 27 Hose Clamp 8 N A 28 Grommet 1 29 Cable Ties 12 N A 30 Tube Cap 1 N A 31 Lockwasher 2 N A 32 1 4 28 Nut 2 N A 33 5 16 24 Nut 4 N A 34 5 16 Vacuum Line 1 TBI Service Parts Air Charge Temperature Sensor 1 534 46 Fuel Injector 900
40. ry including death and or property damage Improper installation and or use of this or any Holley product will void all warranties WARNING Use of some RTV silicone sealers will destroy the oxygen sensor used with this product Ensure the RTV silicone sealant you use is compatible with oxygen sensor vehicles This information should be found on the RTV package 2 0 CHOOSING THE RIGHT SYSTEM To ensure that you have purchased the correct HP EFI kit for your application check be sure that the kit you purchased is listed beside your engine s horsepower NOTE HP throttle body systems do not include fuel pump HORSEPOWER KIT PART NUMBER WTO 529 550 411 HP TBI 900 CFM 75 lb hr injectors Up 10606 550 412 EFI TBI 900 CFM 85 lb hr injectors 3 0 WARNINGS NOTES AND NOTICES WARNING For the safety and protection of you and others only a trained mechanic having adequate fuel system experience must perform the installation adjustment and repair It is particularly important to remember one of the very basic principles of safety fuel vapors are heavier than air and tend to collect in low places where an explosive fuel air mixture may be ignited by any spark or flame resulting in property damage personal injury and or death Extreme caution must be exercised to prevent spillage and thus eliminate the formation of such fuel vapors WARNING This type of work MUST be pe
41. t the throttle plates are vertical when the throttle control is gt on ee wide open Work the throttle linkage back and forth several e times to ensure it operates smoothly with no binding or sticking Figure 1 ball stud in remaining hole in bracket DANGER Sticking throttle may result in uncontrolled engine or vehicle speed This could cause property damage personal injury or death A sticking throttle may be caused by improperly installed throttle cables lack of clearance for any of the throttle linkage or by a binding throttle linkage Check all throttle cables for proper installation and alignment and actuate the throttle to check for any potential binding or clearance problems Repair any problems before continuing 3 Locate the 1 4 28 throttle stud from the parts provided and attach to the throttle lever with the nut provided Connect the accelerator linkage to the throttle stud on the throttle body If the vehicle is equipped with an automatic transmission connect the transmission kickdown rod to the linkage on the throttle body The transmission kickdown may have to be adjusted Follow the vehicle manufacturer s procedure for the correct adjustment procedure NOTE late model GM and Ford overdrive transmissions if the HP ECU is not being set up to control torque converter clutch lock up a competent transmission shop must change the transmission electronic lockup to a mechanical lockup Failure
42. to do so will result in premature transmission failure NOTE On Chrysler vehicles a lever extension will be needed Holley Part Number 20 7 Van applications may require the use of throttle lever extension Holley Part Number 20 14 4 Attach throttle linkage and throttle return spring Have an assistant get in the vehicle and fully depress the accelerator pedal Make the necessary adjustments to the throttle linkage to insure that the throttle reaches wide open position when the accelerator is depressed Work throttle linkage back and forth several times to ensure that it operates smoothly with no binding or sticking DANGER Failure to attach the throttle return spring or a sticking throttle may result in uncontrolled engine or vehicle speed which could cause personal property damage serious injury or death 9 3 MAP Sensor Installation and Vacuum Line Connections 1 The MAP sensor must be installed as close to the vacuum source it is connected to as possible It must be connected to a full manifold vacuum port This is a vacuum source below the throttle body plates The throttle body has a full manifold port that the sensor can be connected to see Figure 2 It is best not to tee multiple items into the port that supplies the MAP sensor The Spark sensor should be mounted such that the vacuum port on the sensor Sy 4 is pointed at some downward angle above the vacuum source so that moisture does not collect in the s
43. uel leaks A fuel leak may result in a fire or explosion hazard which could cause serious injury or death DANGER Failure to use a steel fuel line that meets SAE J526 standards could result in fuel leaks A fuel leak may result in a fire or explosion hazard which could cause serious injury or death DANGER Take precautions to ensure that all fuel line routings are away from heat sources such as the engine or exhaust pipes A fire or explosion hazard could cause serious injury or death DANGER Rigid fuel line tubing should be used for under vehicle runs such as along vehicle frame rails or under floor pans Failure to do so is a potential fire or explosion hazard which could cause serious injury or death 11 Anchor all fuel lines securely to solid chassis members at 1 foot intervals using rubber coated steel clamps Use of only approved steel fuel line tubing will afford maximum fuel line protection against road hazards and premature wearing due to flexing temperature extremes road salt weather etc 9 5 Return Line Installation The Holley HP EFI TBI system requires a return fuel line to the fuel tank Some late model vehicles that were originally equipped with a throttle body injection system may already have a return line to the fuel tank that can be utilized If a return fuel line must be installed a minimum size of 5 16 is recommended The return line is on the passenger side of the TBI unit The fitting on the TBI un

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