Fuel Pressure Regulator: Service and Repair

WARNING The pressure regulator contains a large spring under heavy compression. Use care when removing the screws to prevent personal injury.

NOTE To prevent leaks, the pressure regulator diaphragm assembly must be replaced whenever the cover is removed.

Pressure Regulator Assembly:

REMOVE
- Four pressure regulator attaching screws, while keeping pressure regulator compressed.
- Pressure regulator cover assembly.
- Pressure regulator spring. Refer to WARNING preceding text.
- Spring seat.
- Pressure regulator diaphragm assembly.

INSPECT
Inspect the pressure regulator seat in the fuel meter body cavity for pitting, nicks, or irregularities. (Use a magnifying glass if necessary.) If any of the above is present, the whole fuel body casting must be replaced.

INSTALL
- New pressure regulator diaphragm assembly, making sure it is seated in groove of fuel meter body.
- Regulator spring seat and spring into cover assembly.
- Cover assembly over the diaphragm, while aligning mounting holes.
NOTE Use care while installing pressure regulator to prevent misalignment of diaphragm and possible leaks.
- Four screw assemblies that have been coated with the appropriate thread locking compound, while maintaining pressure on regulator spring. Tighten screw assemblies to 2.5 Nm (22.0 lb-in).
- With engine "OFF" and the ignition "ON", check for fuel leaks.