Fuel Pressure Regulator: Service and Repair

REMOVE
^ Disconnect negative battery terminal.
^ Relieve fuel system pressure. Refer to Fuel System / 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.

Inspect
^ 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.