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Home >> Pontiac >> 2005 >> Aztek Base, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - 3.4L - Introduction >> Repair Instructions >> Fuel Rail Assembly Replacement >> Removal Procedure
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Removal Procedure

NOTE:
  • Use care when servicing the fuel system components, especially the fuel injector electrical connectors, the fuel injector tips, and the injector O-rings. Plug the inlet and the outlet ports of the fuel rail in order to prevent contamination.
  • Do not use compressed air to clean the fuel rail assembly as this may damage the fuel rail components.
  • Do not immerse the fuel rail assembly in a solvent bath in order to prevent damage to the fuel rail assembly.

An eight digit identification number is stamped on the left hand fuel rail (fueling even cylinders 2, 4, 6). Refer to this number if servicing or part replacement is required.

    Fig 1: Identifying Engine Fuel Feed Pipe
    GM22505Courtesy of GENERAL MOTORS CORP.
  1. Relieve fuel system pressure. Refer to Fuel Pressure Relief Procedure .
  2. Remove the upper intake manifold. Refer to Intake Manifold Replacement - Upper in Engine Mechanical.
  3. Disconnect the engine fuel feed pipe at the fuel rail.
    4. Fig 2: View Of Fuel Return Pipe
    GM22507Courtesy of GENERAL MOTORS CORP.
  4. Disconnect the engine fuel return pipe from the fuel pressure regulator.
  5. Remove and discard the fuel feed pipe and fuel return pipe O-rings.
  6. Disconnect the fuel injector harness main electrical connector.
    7. Fig 3: Identifying Lock Release
    GM372749Courtesy of GENERAL MOTORS CORP.
  7. Pull up the lock release of the fuel injector connector (2).
    8. Fig 4: Disconnecting Fuel Injector Electrical Connectors
    GM372753Courtesy of GENERAL MOTORS CORP.
  8. Depress the lock tab (1) and lift the connector from the injector.
  9. Repeat the previous two steps in order to disconnect all of the fuel injector electrical connectors.
  10. Remove the fuel injector wiring harness.
    11. Fig 5: View Of ECT Sensor, Connector And Wiring Harness At Fuel Rail
    GM15986Courtesy of GENERAL MOTORS CORP.
  11. Disconnect the coolant temperature sensor electrical connector.
    12. Fig 6: View Of Fuel Injector Rail Assembly
    GM862487Courtesy of GENERAL MOTORS CORP.
  12. Remove the fuel rail bolts.
  13. Remove the fuel rail with the fuel injectors.
  14. Remove the injector O-ring seal from the spray tip end of each injector.
  15. If you are replacing the fuel rail, remove the fuel injectors from the fuel rail. Refer to Fuel Injector Replacement  in Engine Controls.
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