User Manual Q&AAnswer
Feb 04, 2025 - 02:37 AM
Sure! Here are step-by-step instructions on how to install the Holley Fuel Rails for OE Style Ford 7.3L Godzilla intakes:
1. After the engine has cooled, disconnect the negative battery cable.
2. Disconnect the electrical connector at each injector. Note that the injector harness is specific to injector order. If the harnesses are removed, they must be reinstalled on the correct engine side and to each injector.
3. Clean any dirt or debris near rail connections and injectors.
4. Relieve the fuel system pressure (refer to the vehicle service manual for procedures and precautions for this step).
5. Disconnect the fuel line/lines from the OEM fuel rails using a 3/8" quick-connect tool. Use clean shop towels to catch any gasoline that may escape and to prevent any contaminants from entering the fuel lines.
6. Disconnect any wiring, vacuum lines, and other components interfering with the installation process.
7. Remove the fuel rail mounting and related hardware.
8. Place clean shop towels around the injectors to catch any gasoline that escapes. Pull up on the OE rail assembly. The injectors are sealed on both ends with O-rings. It is recommended that the injectors remain sealed to the fuel rail during removal to prevent large amounts of fuel from escaping onto the engine.
9. Remove injector retaining clips and then remove injectors. Pull straight down on the injectors while gently twisting them. Save the injector retaining clips as you will need them later. Take note of how injector retaining clips are installed, as they will be installed the same way with the Holley fuel rails.
10. Install the -6 O-ring fittings onto each end of the rails before installing the rails on the intake. Lubricate with clean oil.
11. Install the appropriate brackets onto the Holley rails using the supplied M5 bolts and lock washers.
12. Make certain the injectors are free from debris. Inspect each injector O-ring for cracks, nicks, cuts, etc. Replace if there is any damage. Replacement O-rings are available at your local auto parts store.
13. Apply a light coat of clean oil to all O-rings, intake injector bores, and Holley rail bores for ease of installation.
14. Insert each injector into the fuel injector bore of the Holley rails and install injector retaining clips the same way they were installed into the factory fuel rails. Orient the injector connector towards the outside of the car/away from the center of the engine.
15. Install each of the fuel rail/injector assemblies onto the intake manifold. Make certain each of the O-rings is seated at both ends and that none of the O-rings were cut.
16. OEM or similar style/height injectors must be used due to interference issues with the intake manifold. Install the four supplied rail mounting bolts using provided spacers and M6 bolts.
17. Reinstall any intake bolts or other hardware that was removed. Refer to the vehicle service manual for torque values and pattern for this step.
18. Make certain any spilled gasoline and shop towels are removed.
19. Reconnect any wiring, vacuum lines, and throttle body components that were removed.
20. Plumbing will vary per application. Refer to appendix A and B in the instruction manual for hose assembly and routing instructions.
21. Reconnect the battery and turn the ignition to the ON position, but do not start the vehicle. To purge air and build fuel pressure, cycle the ignition from OFF to ON several times, waiting at least 10 seconds with the ignition in the off position each time. Inspect for leaks.
22. Start the engine and inspect for any fuel leaks around the fuel injectors, fuel rail fittings, fuel lines, etc. Take a brief test drive and check again for any fuel leaks.
Please note that these instructions are a summary of the installation process. It is important to refer to the complete instruction manual provided with the product for detailed and specific information.
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