Holley 12-150 user manual

Summary of the content on the page No. 1

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:

P/N DESCRIPTION FLOWS PRESSURE ALCOHOL/METHANOL PRESE

Summary of the content on the page No. 2

4. Connect the fuel line from the tank 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

Summary of the content on the page No. 3

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

Summary of the content on the page No. 4

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

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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-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

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CLEANING THE REGULATOR: 1. Loosen the hex nut on the top of the regulator and back the adjusting screw out all the 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. Thoroughly spray into the ports, as well as into the check ball seat area while depressing the check ball. WARNING!