Fuel Pressure Regulator: Service and Repair

Fuel Pressure Regulator Replacement (Central SFI)

Removal Procedure

Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components. For Vehicles equipped with OnStar (UE1) with Back Up Battery: The Back Up Battery is a redundant power supply to allow limited OnStar functionality in the event of a main vehicle battery power disruption to the VCIM (OnStar module). Do not disconnect the main vehicle battery or remove the OnStar fuse with the ignition key in any position other than OFF. Retained accessory power (RAP) should be allowed to time out or be disabled (simply opening the driver door should disable RAP) before disconnecting power. Disconnecting power to the OnStar module in any way while the ignition is On or with RAP activated may cause activation of the OnStar Back-Up Battery (BUB) system and will discharge and permanently damage the back-up battery. Once the Back-Up Battery is activated it will stay on until it has completely discharged. The BUB is not rechargeable and once activated the BUB must be replaced.

1. Disconnect the negative battery cable.
2. Relieve the fuel system pressure. Refer to Fuel Pressure Relief Procedure Service and Repair.
3. Remove the upper manifold assembly. Refer to Service and Repair.

Disassemble Procedure






Important: If the fuel pressure regulator is to be reinstalled, inspect the filter screen (if equipped) for contamination. If the filter screen is contaminated, remove and discard.

1. Disassemble the fuel pressure regulator snap ring retainer.






2. Disassemble the regulator assembly and the O-rings.
3. Discard the O-rings.

Assemble Procedure






1. Lubricate the new O-rings with clean engine oil.
2. Install the backup O-ring, the large O-ring, the filter and the small O-ring.






3. Assemble the regulator with the vacuum tube pointing down into the snap ring retainer.

Installation Procedure

1. Install the upper manifold assembly. Refer to Service and Repair.
2. Connect the negative battery cable.