Holley 12-125 manual

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Table of contents for the manual

  • Page 1

    HP FUEL PUMPS P/N 12-125 and 12-150 Installation Instructions WARNING! THESE INSTRUCTIONS MUST BE REA D AND FULLY UNDERST OOD BEFORE BEGINNING INSTA LLATION. FA ILURE TO FOLLOW THESE INSTRUCTIONS MAY RESULT IN POOR PERFO RMANCE, VEHICLE DA MAGE, PERSONA L INJURY, OR DEAT H. IF THESE INSTRUCTIONS ARE NOT FULLY UNDERST OOD, INSTA LLATION SHOULD NOT B[...]

  • Page 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 fu[...]

  • Page 3

    WIRING: There are 2 methods to wire the pump: (1) To wire the fuel pump with a relay (2) To w ire the fuel pump with an oil pressure s afety switch. (1) WIRING THE FUEL PUMP WITH A RELAY: NOTE: You will need Holley Fuel pump relay kit P/N 12-753 or equiv alent 4-w ire relay. 1. Disconnect the cables from the battery. 2. Mount relay on firewall of e[...]

  • Page 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 t he on terminal of the ignition switch. 8. Connect the terminal marked “NC” to the starte r terminal that’s hot ( 12V) during cranking only. 9. To complete the ins[...]

  • Page 5

    Figure 4 4. Turn the pump upside down, remove the three bolts, and care fully 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 GEROTO R TOGETHER AS A MATCHED SET. TH IS A SSEMBLY MUST BE REASSEMBLED THE SA ME WAY IT WAS DISA SS[...]

  • Page 6

    CLEANING THE REGULATOR: Figure 5 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 will fall out. 3. Use a spray-type carburetor cleaner to clean the cover and regu[...]