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FUEL PRESSURE REGULATOR SERVICE

REMOVAL

WARNING: THE 3.0L MPI FUEL SYSTEM IS UNDER A CONSTANT PRESSURE OF APPROXIMATELY 330 KPA (48 PSI). PERFORM FUEL PRESSURE RELEASE PROCEDURE BEFORE SERVICING THE FUEL PRESSURE REGULATOR.

(1)Perform the Fuel Pressure Release Procedure.

(2)Disconnect negative cable from battery.

(3)Loosen fuel return hose clamp and remove fuel return hose from nipple.

(4)Remove vacuum hose from fuel pressure regulator. (Fig. 14)

(5)Remove screw holding fuel return tube to the intake manifold.

(6)Remove fuel pressure regulator screws. Remove fuel pressure regulator from engine.

Fig. 14 Fuel Pressure Regulator

INSTALLATION

(1)Lubricate O-ring on fuel pressure regulator with clean 30 weight engine oil.

(2)Install fuel pressure regulator into fuel rail. Tighten screws to 10 NIm (90 in. lbs.) torque.

(3)Install screw holding fuel return tube clamp in place. Tighten screw to 10 NIm (95 in. lbs.) torque.

(4)Connect vacuum hose to fuel pressure regulator.

(5)Connect fuel return hose to fuel return tube. Tighten hose clamp to 1 NIm (10 in. lbs.) torque.

(6)Connect negative battery cable.

CAUTION: When using the ASD Fuel System Test, the Auto Shutdown (ASD) Relay remains energized for either 7 minutes, until the test is stopped, or until the ignition switch is turned to the Off position.

(7) With the ignition key in ON position, access the DRB II ASD Fuel System Test to pressurize the fuel system. Check for leaks.

FUEL SYSTEMS 14 - 133

FUEL INJECTORS

WARNING: THE 3.0L MPI FUEL SYSTEM IS UNDER A CONSTANT PRESSURE OF APPROXIMATELY 330 KPA (48 PSI). PERFORM FUEL PRESSURE RELEASE PROCEDURE BEFORE SERVICING THE FUEL INJECTORS.

REMOVAL

(1)Perform the Fuel Pressure Release Procedure.

(2)Disconnect negative cable from battery.

The fuel rail must be removed first to service the injectors. Refer to Fuel Injector Rail Assembly Removal in this section.

(3)Label each injector connector with its cylinder number. Disconnect electrical connector from injector.

(4)Position fuel rail assembly so that the fuel injectors are easily accessible.

(5)Remove injector clip from fuel rail and injector (Fig. 15).

Fig. 15 Fuel Injector and Rail

(6)Pull injector straight out of fuel rail receiver cup (Fig. 16).

(7)Check injector O-ring for damage. If O-ring is damaged, it must be replaced. If injector is to be reused, a protective cap must be installed on the injector tip to prevent damage.

(8)Repeat procedure for remaining injectors.

INSTALLATION

(1) Before installing an injector, the rubber O-ring must be lubricated with a drop of clean engine oil to aid in installation.