Holley 12-125 User's Manual
Contents
1. 4 Screw a 1 8 pipe tee onto the nipple and position it in a manner to facilitate the installation of the original oil pressure switch and the new oil pressure safety switch in the remaining two holes 5 Screw in the two switches and reconnect the lead to the original equipment oil pressure switch NOTE The pump oil pressure switch will normally have three terminals marked C common NC normally closed and NO normally open Oil Pressure Safety Switch ol Relay Wiring Harness 154 Fuse __Green Black J Red M Battery IgnitionU COE Switch il LL Fuel it Black Pump Black to Ground to Ground Figure 3 6 Connect the fuel pump red lead to the terminal marked C In this line add an in line fuse holder and a 15 amp fuse 7 Connect the terminal marked NO to the on terminal of the ignition switch 8 Connect the terminal marked NC to the starter terminal that s hot 12V during cranking only 9 To complete the installation connect the ground cable to the battery WARNING USE A MINIMUM OF 12 14 GAUGE WIRE BE SURE TO CRIMP ALL CONNECTORS SECURELY AND CLEAN ANY AREA WHERE GROUND LEADS WILL BE FASTENED FAILURE TO USE THE MINIMUM WIRE GAUGE COULD RESULT INA PUMP MALFUNCTION AND OR ELECTRICAL FIRE RESULTING IN PROPERTY DAMAGE SERIOUS INJURY AND OR DEATH MAINTENANCE AND CLEANING INSTRUCTIONS FOR HP PUMPS Due to the current poor quality gasoline that s available2. Ring 5 Very carefully remove the gerotor assembly both parts from the pump housing WARNING KEEP THE GEROTOR TOGETHER AS A MATCHED SET THIS ASSEMBLY MUST BE REASSEMBLED THE SAME WAY IT WAS DISASSEMBLED THE TOP OF EACH PART MUST REMAIN TOWARD THE TOP OF THE PUMP WARNING DO NOT IMMERSE THE ENTIRE UNIT IN ANY LIQUID IMMERSION COULD DAMAGE THE ELECTRICAL CIRCUITRY RESULTING IN A PUMP MALFUNCTION A PUMP MALFUNCTION COULD RESULT IN A FIRE WHICH MAY RESULT IN PROPERTY DAMAGE SERIOUS INJURY OR DEATH 6 Remove the relief valve plug along with the O Ring and shim Not all pumps use a shim Then remove the spring and relief valve piston 7 Donot remove the motor assembly from the pump housing assembly If the pump seal is leaking please call Holley Tech Service at 270 781 9741 for assistance 8 Clean the housing assembly pump plate and pump cover assembly with any good quality spray type carburetor cleaner Make sure the gasket surfaces are clean Blow parts dry with compressed air Clean any loose Teflon sealant etc from the inlet and outlet ports 9 Inspect the gerotor assembly and its corresponding contact surfaces for damage such as pits gouges or deep scratches Damage and wear of this nature can greatly affect the pump s performance Suspect components should be replaced 10 Reassemble the pump in reverse order of the disassembly Lubricate all friction surfaces during the assembly with WD 40 or equivalent 11 Insert t
3. _ Holicy Since 1903 HP FUEL PUMPS P N 12 125 and 12 150 Installation Instructions WARNING THESE INSTRUCTIONS MUST BE READ AND FULLY UNDERSTOOD BEFORE BEGINNING INSTALLATION FAILURE TO FOLLOW THESE INSTRUCTIONS MAY RESULT IN POOR PERFORMANCE VEHICLE DAMAGE PERSONAL INJURY OR DEATH IF THESE INSTRUCTIONS ARE NOT FULLY UNDERSTOOD INSTALLATION SHOULD NOT BE ATTEMPTED PLEASE CONSULT HOLLEY TECH SERVICE OR A QUALIFIED MECHANIC APPLICATIONS CP DESORPTION OMS REGULATOR COMPATIBLE PRESSURE REGULATOR oa TIBLE PRESSURE Billet Aluminum Pump One 125 GPH Built In 7 PSI max 3 8 NPT Inlet One 3 8 Free Flow NPT Outlet Billet Aluminum Pump One 3 8 NPT Inlet One 3 8 NPT Outlet SAFETY SWITCH SHUT OFF Recommended P N 12 810 150 GPH Free Flow 12 803 included 17 PSI max Recommended P N 12 810 INTRODUCTION Congratulations on your purchase of the Holley HP fuel pump This instruction sheet contains all the information needed to install this fuel pump Please read all the WARNINGS and NOTES They contain valuable information that can save you time and money Holley Performance Products cannot and will not be responsible for any alleged or actual engine or other damage or other conditions resulting from misapplication of the HP fuel pumps and fuel pressure regulators described herein However it is our intent to provide the best possible products for our customer products that perform proper
4. DO NOT OVER TIGHTEN THE FITTINGS ON THE FUEL PUMP TORQUE 3 8 NPT FITTINGS ONLY TO 15 FT LBS OVER TIGHTENING OF THE FITTINGS CAN CAUSE THE PUMP BASE TO CRACK ALLOWING FUEL TO LEAK A FUEL LEAK CAN CAUSE A FIRE AND OR EXPLOSION RESULTING IN PROPERTY DAMAGE SERIOUS INJURY AND OR DEATH BRESSURE FUEL STORAGE REGULATOR FILTER TANK High Performance Fuel System Figure 1 USING A FUEL PRESSURE REGULATOR WITH A FUEL PUMP If the pump is a high pressure model a pressure regulator must be installed in the line between the pump and the carburetor NOTE For optimum performance and precise fuel control Holley ALWAYS RECOMMENDS using a Fuel Pressure Regulator 1 Using the bracket supplied with the regulator position the regulator as close to the carburetor as possible taking care to minimize the exposure to heat sources DO NOT mount the regulator on the exhaust manifold or any extremely hot surface NOTE The fuel pressure regulator is included with the 12 150 Plug any unused ports 2 Connect the fuel line from the out side of the pump to the in side on the regulator All fuel line connections must be leakproof 3 Connect the out side of the regulator to the fuel inlet on the carburetor s All fuel line connections must be leakproof 4 The regulator comes from Holley with the regulator pressure preset at 6 psi However for individual requirements it may be readjusted The pressure is increased by loosening the regula
5. ack wire to a switched 12V source 6 Connect one of the red wires to the positive wire red wire of the fuel pump 7 Attach the in line fuse holder to the remaining red wire After attaching the fuse holder insert the 15A fuse and connect to the positive side of the battery using 12 gauge wire 8 Reconnect the battery cables Relay Wiring Harnes Battery v n Black v Switched 12V I Black Black to Ground to Ground ad Figure 2 2 WIRING THE FUEL PUMP WITH AN OIL PRESSURE SAFETY SWITCH One method is to wire the pump to a switched 12 volt source providing power only when the engine is running located at the vehicle s electric panel To ensure this condition the installation of a Holley 12 810 oil pressure safety switch is recommended for installation into the wiring circuit This will ensure that the pump will not continue to operate after the engine is shut off and or when the key is left in the ON position If the pressure switch is to be used follow the installation instructions as outlined below refer to Figure 3 Use 12 gauge wire for power BAT and ground wires 1 Disconnect the ground cable from the battery 2 Remove the original equipment oil pressure switch and retain 3 Screw a 1 8 pipe nipple into the hole from which the original pressure switch was removed Use any suitable thread sealant on all fittings taking care to avoid any excess that might contaminate the engine
6. he relief valve piston into the pump cover assembly The rubber end goes in first followed by the spring Replace the relief valve plug with the O Ring making sure to replace the small brass shim on the end if used on your pump 12 Turn the pump housing over and insert the gerotor assembly Keep the same sides up WARNING MAKE SURE THE GEROTOR ASSEMBLY IS REPLACED IN THE SAME ORIENTATION AS WHEN IT WAS DISASSEMBLED KEEP THE SAME SIDES UP 13 Set the large O Ring in place on the pump housing along with the pump plate gasket and pump cover assembly These parts can only be positioned one way in order for the bolt holes to align Apply a drop of Loctite to each screw Insert the bolts and tighten to 50 60 in lbs of torque WARNING OVERTIGHTENING CAN CAUSE THE PUMP BASE TO CRACK ALLOWING FUEL TO LEAK A FUEL LEAK CAN CAUSE A FIRE AND OR EXPLOSION RESULTING IN PROPERTY DAMAGE SERIOUS INJURY AND OR DEATH 14 Replace the inlet filter screens along with the fuel fittings Teflon paste can be used on the fittings and they should be torqued to 15 ft Ibs See the warning above WARNING DO NOT USE TEFLON TAPE ON PUMP FITTINGS THIS TAPE CAN BREAK DOWN WHEN IT COMES IN CONTACT WITH FUEL THE TEFLON TAPE MAY PLUG THE FUEL PUMP CAUSING DAMAGE TO THE PUMP AND THE FUEL SYSTEM 15 Reinstall the pump in the vehicle CLEANING THE REGULATOR Hex Nut ee Pressure 1 Loosen the hex nut on the top of the regulator and back the adjusting screw o
7. it is recommended that periodically a can of dry gas such as STP water remover be used to absorb the water out of the fuel delivery system The fuel filter element should be blown clean with compressed air every 6 000 miles and replaced every 12 000 miles to assure maximum protections If your fuel pump fails to pump or fails to maintain adequate pressure check the following 1 Check the voltage at the pump to assure a 12 volt supply 2 Check the fuel line especially the fuel filter for any obstruction Use compressed air to blow the line free 3 If this doesn t solve the problem turn the pump on and listen for a hum from the top of the pump If there is no hum the pump electrical system should be checked by a competent repairman If the pump hums it probably only needs to be cleaned See Figure 4 CLEANING THE PUMP The following is a step by step procedure for cleaning the Holley electric fuel pumps Do all disassembling on a clean bench Read all instructions thoroughly and completely before starting 1 Remove the pump from the car 2 Remove the inlet and outlet line fittings from the pump housing assembly 3 Remove the filter screen from the inlet port and clean thoroughly with a spray type carburetor cleaner Relief Valve End Cap 4 Assembly Assembly Assembly Figure 4 4 Turn the pump upside down remove the three bolts and carefully lift off the pump cover followed by the gasket pump plate and O
8. ly and satisfy your expectations Should you need information or parts assistance please contact our Technical Service Dept at 1 270 781 9741 Monday through Friday 7 a m to 5 p m Central Time Please have the part number of the product you purchased when you call NOTE A top quality fuel filter at 70 micron or less fuel hose and clamps 12 gauge wire fuel fittings assorted terminals a relay and an optional safety shut off switch is required to complete the installation of the HP fuel pump These parts are not included with the HP fuel pump Z O m The 12 150 HP fuel pump requires the use of a fuel pressure regulator Holley P N 12 803 is included for this reason Z O Mur m For optimum performance and precise fuel control Holley ALWAYS RECOMMENDS using a Fuel Pressure Regulator SPECIAL CONSIDERATIONS FOR PUMPS SUBJECTED TO HIGH TEMPERATURES In applications where the fuel pump is subjected to high temperatures due to climate towing close proximity of exhaust components high under car temperatures etc Holley highly recommends the use of a bypass style regulator such as Holley PN 12 803BP to eliminate potential vapor lock issues that may occur due to the sensitivity of new fuels If you are experiencing fluctuations in pressure readings or no flow conditions when temperatures rise you will need to install a bypass regulator PUMP MOUNTING AND INSTALLATION The best location for mounting any electric fuel pum
9. p is the rear of the vehicle near the fuel tank and in a position that will allow the fuel to be gravity fed to the pump The pump should be mounted on a solid member such as the chassis in a vertical position with the pump motor on top Avoid exposure of the pump and fuel lines to moving parts and to any hot areas such as the exhaust manifold The pump should not be mounted in an enclosed area such as the vehicle s trunk Follow the steps below for mounting the pump WARNING THE PUMP MUST BE PLACED WHERE INTERFERENCE BETWEEN THE VEHICLE S BODY AND ITS CHASSIS MOVEMENT IS AVOIDED THE PUMP AND ITS CONNECTING HOSES MUST NOT BE SUBJECTED TO LOW GROUND CLEARANCE WHERE ANY FLYING ROCKS OR ROAD DEBRIS CAN CAUSE DAMAGE FAILURE TO AVOID THESE HAZARDS WILL LEAD TO PUMP DAMAGE WHICH COULD RESULT IN FIRE AND OR PROPERTY DAMAGE SERIOUS INJURY AND OR DEATH 1 Select a mounting site as close as possible to the fuel supply and away from possible sources of heat as detailed previously 2 Use the mounting bracket attached to the pump as a template and drill two clearance holes for 5 16 bolts 3 Mount the pump in the vertical position motor on top using two 5 16 bolts NOTE To ensure pump life and flow efficiency a quality fuel filter such as Holley P N 162 515 must be installed between the tank and each pump inlet The filter should be supported in such a manner that it does not hang from the fuel lines 4 Connect the fuel line from the tank
10. to the fuel filter and then to the inlet port of the pump Connect the carburetor delivery line to the outlet port of the pump and to the regulator for the 12 150 located near the carburetor inlet See Figure 1 The fuel pump inlet and outlet ports take a 3 8 NPT fitting therefore a 3 8 or larger fuel line is recommended 5 Install the inlet filter screens with the fuel fittings Teflon paste can be used on the fittings and torqued to 15 ft lbs See warning below WARNING DO NOT USE TEFLON TAPE ON PUMP FITTINGS THIS TAPE CAN BREAK DOWN WHEN IT COMES IN CONTACT WITH FUEL THE TEFLON TAPE MAY PLUG THE FUEL PUMP CAUSING DAMAGE TO THE PUMP AND THE FUEL SYSTEM NOTE Avoid unnecessary restrictions such as sharp bends and undersized fuel fittings and hoses Avoid routing fuel lines in areas that would cause chafing All fuel line connections must be leak proof WARNING IF SPLICING INTO EXISTING FUEL LINES USE EXTREME CARE TO AVOID CONTAMINATING THE LINE WITH RUBBER OR METAL SHAVINGS AS THIS WILL DAMAGE THE PUMP IF THE FUEL LINE HAS BEEN CUT IT IS ESSENTIAL THAT IT BE CLEANED TO ENSURE THAT NO METAL OR RUBBER PARTICLES ENTER THE FUEL SYSTEM THIS IS PERFORMED BY BLOWING THE LINE CLEAN WITH COMPRESSED AIR HOLLEY DOES NOT RECOMMEND THE PROCEDURE WHERE THE COIL WIRE IS DISCONNECTED THE ENGINE IS CRANKED AND THE FUEL IS COLLECTED IN A CONTAINER SPARKING CAN OCCUR DURING THIS PROCEDURE WHICH MAY RESULT IN A FIRE AND OR EXPLOSION WARNING
11. tor locknut and turning the adjustment screw clock wise Decrease pressure by turning the adjustment screw counter clockwise Pressure adjustments can only be made while the engine is running Due to the high volume design of these regulators pressure settings may not be maintained with a zero flow WARNING IF YOU TURN THE ADJUSTMENT SCREW ALL THE WAY IN IT WILL RESULT IN EXCESSIVE FUEL PRESSURE AND CAUSE THE CARBURETOR TO FLOOD A FLOODED CARB CAN CAUSE A FIRE AND OR EXPLOSION RESULTING IN PROPERTY DAMAGE SERIOUS INJURY AND OR DEATH ALWAYS USE A FUEL PRESSURE GAUGE SUCH AS HOLLEY P N 26 500 BETWEEN THE REGULATOR AND THE CARB S WHEN ADJUSTING THE FUEL PRESSURE REGULATOR WIRING There are 2 methods to wire the pump 1 To wire the fuel pump with a relay 2 To wire the fuel pump with an oil pressure safety switch 1 WIRING THE FUEL PUMP WITH A RELAY NOTE You will need Holley Fuel pump relay kit P N 12 753 or equivalent 4 wire relay 1 Disconnect the cables from the battery 2 Mount relay on firewall of engine compartment using a sheet metal screw WARNING Before punching or drilling a hole in the firewall make sure you know what is on the other side to avoid puncturing equipment such as heater cores air conditioning system equipment hoses or wiring 3 Plug the fuel pump relay harness into the relay until it locks into place 4 Connect the black wire of the harness to ground using 12 gauge wire 5 Connect the Green Bl
12. ut all the ae way to relieve tension on the diaphragm spring See Figure 5 2 Remove the four screws holding the regulator cover on The diaphragm and spring Figure 5 will fall out 3 Use a spray type carburetor cleaner to clean the cover and regulator body Spring Thoroughly spray into the ports as well as into the check ball seat area while depressing the check ball Diaphragm WARNING THE BRASS SEAT ASSEMBLY IS PRESSED IN AND SHOULD NOT BE REMOVED Check Ball amp Seat 4 Blow the cover and body dry with compressed air and reassemble following the diagram 5 Be sure to readjust the fuel pressure with the adjusting screw after installing in your vehicle Pressure adjustments must be made with the engine running SERVICE PARTS AND ACCESSORIES ITEM Chevy Small Block Mechanical Pump Block Off Plate 0 30 PSI Fuel Pressure Gauge non liquid filled 1 1 2 Dia 1 8 NPT 26 502 0 30 PSI Fuel Pressure Gauge liquid filled 1 1 2 Dia 1 8 NPT Holley Performance Products Technical Support Toll Free Phone 1 866 GOHOLLEY Phone 1 270 781 9741 Fax 1 270 781 9772 For online help please refer to the Tech Service section of our website www holley com 199R10367 Date 12 12 06
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