Fuel Meter Body: Service and Repair

FUEL INJECTOR FUEL METER BODY REPLACEMENT

Removal Procedure

An 8-digit part identification number is on a mylar label affixed to the fuel meter body assembly. Refer to this number if servicing or part replacement is required.

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. Fuel System Pressure Relief

3. Remove the upper intake manifold assembly. Upper Intake Manifold Replacement

Notice: Do not use any solvent that contains Methyl Ethyl Ketone (MEK). This solvent may damage fuel system components.

4. Before removal, clean the fuel meter body assembly with a spray type engine cleaner, GM X-30A or the equivalent, if necessary. Follow the package instructions. DO NOT soak fuel meter body assemblies in liquid cleaning solvent.






Notice: Cover the injector sockets in order to prevent dirt and other contaminants from entering the open fuel passages.

Important: When disconnecting the injectors, remember the sequence in order to ensure correct injectors placement to each cylinder.

5. Lightly pull on the injector tube and use a small pocket screwdriver to remove the injector from the manifold.






6. Remove the fuel meter body from the bracket by releasing the lock tabs on the bracket.

Installation Procedure






1. Install the fuel meter body in the intake manifold.

2. Push the fuel meter body into the bracket. Make sure all of the tabs are locked into place.






Caution: Verify that the poppet nozzles are firmly seated and locked in their casting sockets in order to reduce the risk of fire and personal injury. An unlocked poppet nozzle could work loose from its socket and produce a fuel leak.

Important: The fuel meter body assemblies are numbered to indicate poppet nozzle order.

3. Push the injectors into the casting sockets.

4. Inspect the injectors in order to ensure they are firmly seated and locked in the casting sockets.

5. Install the upper intake manifold assembly. Refer to Upper Intake Manifold Replacement.

6. Tighten the fuel filler cap.

7. Connect the negative battery cable.

8. Inspect for leaks.
A. Turn ON the ignition for 2 seconds.
B. Turn OFF the ignition for 10 seconds.
C. Turn ON the ignition.
D. Inspect for fuel leaks.