GM Service Manual Online
For 1990-2009 cars only

Cleaning and Inspection Procedure

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

Removing the fuel meter body assembly from the engine requires removing the top portion of the intake manifold, called the upper manifold assembly and throttle body.

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

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Notice: Do not use a cleaner which contains methyl ethyl ketone. This extremely strong solvent may damage components and is not necessary for this type of cleaning.

Use a carburetor cleaner in order to remove deposits.

Refer to the instructions provided with the cleaner.

  • Before removal, the fuel meter body assembly may be cleaned with a spray type engine cleaner, GM X-30A or the equivalent.
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  • Follow the package instructions.
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  • Do not soak fuel meter body assemblies in liquid cleaning solvent.
  • 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.

    1. Disconnect the negative battery cable.
    2. Relieve the fuel system pressure. Refer to Fuel Pressure Relief Procedure .

    3. Object Number: 12860  Size: SH
    4. Remove the electrical connector to the fuel meter body.

    5. Object Number: 12858  Size: SH
    6. Remove the fuel feed and the return hoses from the engine fuel pipes.
    7. Remove the engine fuel pipe retainer nuts and retainer.
    8. Remove the engine fuel pipes by lifting straight up and away from the fuel meter body.
    9. Remove the upper manifold assembly.

    10. Object Number: 12866  Size: SH

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

    11. Squeeze the poppet nozzle locking tabs together while lifting the nozzle out of the casting socket.

    12. Object Number: 12867  Size: SH
    13. Remove the fuel meter body from the bracket by releasing the lock tabs on the bracket.

    Installation Procedure


      Object Number: 12867  Size: SH

      Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

    1. Install the fuel meter body retaining bracket in the intake manifold.
    2. Tighten
      Tighten the attaching bolts to 10 N·m (88 lb in).


      Object Number: 12866  Size: SH

      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.

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

    5. Object Number: 12860  Size: SH

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

    6. Push the poppet nozzles into the casting sockets.
    7. Inspect the poppet nozzles in order to ensure they are firmly seated and locked in the casting sockets.
    8. Install the upper manifold assembly. Refer to Intake Manifold Replacement in Engine Mechanical.

    9. Object Number: 12860  Size: SH
    10. Connect the upper manifold electrical connector.

    11. Object Number: 12858  Size: SH
    12. Install the new O-ring seal on the engine fuel feed and the return pipes.
    13. Tighten
      Tighten the fuel feed and return pipe retainer nuts to the fuel meter body to 3.0 N·m(27 lb in).

    14. Install the fuel feed and the return hoses to the engine fuel pipes.
    15. Tighten
      Tighten the fuel pipe nuts to 30.0 N·m (22 lb ft).

    16. Inspect for fuel leaks.
    17. 10.1. Connect the negative battery cable.
      10.2. Turn ON the ignition switch for 2 seconds.
      10.3. Turn the ignition switch to the OFF position for 10 seconds.
      10.4. Turn the ignition switch back to the ON position.
      10.5. Check for fuel leaks.
      10.6. Tighten the fuel filler cap.