Fuel Pressure Regulator: Service and Repair

REMOVE
- Disconnect negative battery terminal.
- Relieve fuel system pressure. Refer to Fuel System / Service And Repair. Service and Repair
- Intake manifold plenum.
- Fuel rail assembly.

DISASSEMBLE
- Pressure regulator bracket attaching screws and pressure regulator mounting bracket.
- Left and right hand fuel rails from pressure regulator base.
- Base to rail connectors from regulator base, or rails.
- Connector O-rings, from base to rail connectors and discard.
- Fuel return O-rings from fuel rails and discard.

ASSEMBLE
- Lubricate new fuel return O-rings with engine oil, and install on fuel rails. (Fuel return O-ring is larger in diameter than the connector O-ring).
- Lubricate new connector O-rings with engine oil, and install on base to rail connectors.
- Base to rail connectors into regulator base.
- Left and right hand fuel rails to regulator base.
- Pressure regulator mounting bracket with pressure regulator bracket attaching screws.

TIGHTEN
- Pressure regulator bracket screws to 3.2 Nm (28 lb in.)
- Fuel inlet fitting to 48 Nm (35 lb ft.)
- Fuel outlet fitting to 40 Nm (30 lb ft.)

INSTALL
- Fuel rail assembly.


NOTE: Test injector seals now.
- Temporarily connect negative battery terminal.
- Turn ignition switch to the "ON" position for two seconds, then turn to the "OFF" position for ten seconds. Again turn to the "ON" position and check for fuel leaks.
- Disconnect negative battery terminal.

- Intake manifold plenum.
- Tighten fuel filler cap.
- Negative battery terminal.

IDLE LEARN PROCEDURE
Any time the battery is disconnected, the programmed position of the Idle Air Control (IAC) valve pintle is lost, and replaced with a "default" value. To return the IAC valve pintle to the correct position, perform the following procedure:

- Restore battery power.
- Connect Tech I "Scan" tool.
- Select "IAC SYSTEM," then select "IDLE LEARN" in the "MISC TEST" mode.
- Proceed with idle learn as directed.

This procedure allows the Electronic Control Module (ECM) memory to be updated with the correct IAC valve pintle position, for the vehicle, and provide a stable idle speed