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Manual Holley 12-125

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  • Holley 12-125 - 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 ...

  • Holley 12-125 - 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 ...

  • Holley 12-125 - 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 ...

  • Holley 12-125 - 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 ...

  • Holley 12-125 - 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 ...

  • Holley 12-125 - 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 ...

Manufacturer Holley Category Automobile Parts

Documents that we receive from a manufacturer of a Holley 12-125 can be divided into several groups. They are, among others:
- Holley technical drawings
- 12-125 manuals
- Holley product data sheets
- information booklets
- or energy labels Holley 12-125
All of them are important, but the most important information from the point of view of use of the device are in the user manual Holley 12-125.

A group of documents referred to as user manuals is also divided into more specific types, such as: Installation manuals Holley 12-125, service manual, brief instructions and user manuals Holley 12-125. Depending on your needs, you should look for the document you need. In our website you can view the most popular manual of the product Holley 12-125.

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A complete manual for the device Holley 12-125, how should it look like?
A manual, also referred to as a user manual, or simply "instructions" is a technical document designed to assist in the use Holley 12-125 by users. Manuals are usually written by a technical writer, but in a language understandable to all users of Holley 12-125.

A complete Holley manual, should contain several basic components. Some of them are less important, such as: cover / title page or copyright page. However, the remaining part should provide us with information that is important from the point of view of the user.

1. Preface and tips on how to use the manual Holley 12-125 - At the beginning of each manual we should find clues about how to use the guidelines. It should include information about the location of the Contents of the Holley 12-125, FAQ or common problems, i.e. places that are most often searched by users in each manual
2. Contents - index of all tips concerning the Holley 12-125, that we can find in the current document
3. Tips how to use the basic functions of the device Holley 12-125 - which should help us in our first steps of using Holley 12-125
4. Troubleshooting - systematic sequence of activities that will help us diagnose and subsequently solve the most important problems with Holley 12-125
5. FAQ - Frequently Asked Questions
6. Contact detailsInformation about where to look for contact to the manufacturer/service of Holley 12-125 in a specific country, if it was not possible to solve the problem on our own.

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