GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

Important: Clean the fuel/evaporative emissions (EVAP) pipe connections and surrounding areas before disconnecting the pipes in order to avoid possible contamination of the fuel/EVAP system.


    Object Number: 856643  Size: SH
  1. Relieve the fuel system pressure. Refer to Fuel Pressure Relief .
  2. Disconnect the fuel feed and return pipes (1) at the fuel rail. Refer to Metal Collar Quick Connect Fitting Service .
  3. Disconnect the EVAP canister purge pipe (3). Refer to Plastic Collar Quick Connect Fitting Service .
  4. Cap the fuel rail and EVAP pipes in order to prevent possible contamination of the EVAP/fuel system.
  5. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.

  6. Object Number: 899634  Size: SH
  7. Remove the nuts securing the left catalytic converter to the exhaust manifold.

  8. Object Number: 899636  Size: SH
  9. Remove the nuts securing the right catalytic converter to the exhaust manifold.
  10. Lower the catalytic converter assembly until it rests on the vehicle frame.

  11. Object Number: 899733  Size: SH
  12. Use the following procedure if the vehicle is equipped with 2 wheel drive (2WD):
  13. 9.1. Support the transmission with a suitable transmission jack.
    9.2. Remove the transmission support. Refer to Transmission Support Replacement in Frame and Underbody.
    9.3. Lower the transmission slightly.
    9.4. Remove the EVAP/fuel hose/pipe assembly from the retaining clips (1) on the transmission.

    Object Number: 899734  Size: SH
  14. Use the following procedure if the vehicle is equipped with 4 wheel drive (4WD):
  15. 10.1. Remove the transfer case. Refer to Transfer Case Assembly Replacement in Transfer Case - NVG 126-NP4 or to Transfer Case Assembly Replacement in Transfer Case - NVG 226-NP8.
    10.2. Remove the front propeller shaft. Refer to Front Propeller Shaft Replacement in Propeller Shaft.
    10.3. Support the transmission with a suitable transmission jack.
    10.4. Remove the transmission support. Refer to Transmission Support Replacement in Frame and Underbody.
    10.5. Lower the transmission slightly.
    10.6. Remove the EVAP/fuel hose/pipe assembly from the retaining clips (1) on the transmission.

    Object Number: 856643  Size: SH
  16. Remove the EVAP/fuel hose/pipe bracket nut (2).
  17. Remove the fuel hose/pipe bracket from the bellhousing stud.

  18. Object Number: 899732  Size: SH
  19. Disconnect the fuel return pipe and EVAP pipe from the fuel tank pipes. Refer to Plastic Collar Quick Connect Fitting Service .
  20. Disconnect the fuel feed pipe from the fuel filter. Refer to Plastic Collar Quick Connect Fitting Service .
  21. Cap the fuel filter and pipes at the fuel tank.
  22. Remove the EVAP/fuel hose/pipe assembly from the vehicle.
  23. Important: Note the position of the EVAP/fuel hose/pipe assembly clips prior to disassembly.

  24. Remove the EVAP/fuel hose/pipe assembly retaining clips.
  25. Remove the fuel feed or return pipe to be replaced from the EVAP/fuel hose/pipe assembly.

Installation Procedure

  1. Install the fuel feed or return pipe to the EVAP/fuel hose/pipe assembly.
  2. Install the EVAP/fuel hose/pipe assembly retaining clips.

  3. Object Number: 899732  Size: SH
  4. Install the EVAP/fuel hose/pipe assembly to the vehicle.
  5. Remove the caps from the fuel filter and pipes at the fuel tank.
  6. Connect the fuel return pipe and EVAP pipe to the fuel tank pipes. Refer to Plastic Collar Quick Connect Fitting Service .
  7. Connect the fuel feed pipe to the fuel filter. Refer to Plastic Collar Quick Connect Fitting Service .

  8. Object Number: 856643  Size: SH
  9. Install the EVAP/fuel hose/pipe bracket to the bellhousing stud.
  10. Notice: Refer to Fastener Notice in the Preface section.

  11. Install the EVAP/fuel hose/pipe bracket nut (2).
  12. Tighten
    Tighten the nut to 10 N·m (89 lb in).


    Object Number: 899734  Size: SH
  13. Use the following procedure if the vehicle is equipped with 4WD:
  14. 9.1. Install the EVAP/fuel hose/pipe assembly to the retaining clips (1) on the transmission.
    9.2. Raise the transmission to the normal installed height.
    9.3. Install the transmission support. Refer to Transmission Support Replacement in Frame and Underbody.
    9.4. Remove the transmission jack.
    9.5. Install the front propeller shaft. Refer to Front Propeller Shaft Replacement in Propeller Shaft.
    9.6. Install the transfer case. Refer to Transfer Case Assembly Replacement in Transfer Case - NVG 126-NP4 or to Transfer Case Assembly Replacement in Transfer Case - NVG 226-NP8.

    Object Number: 899733  Size: SH
  15. Use the following procedure if the vehicle is equipped with 2WD:
  16. 10.1. Install the EVAP/fuel hose/pipe assembly to the retaining clips (1) on the transmission.
    10.2. Raise the transmission to the normal installed height.
    10.3. Install the transmission support. Refer to Transmission Support Replacement in Frame and Underbody.
    10.4. Remove the transmission jack.

    Object Number: 899636  Size: SH
  17. Install the nuts securing the right catalytic converter to the exhaust manifold.
  18. Tighten
    Tighten the nuts to 50 N·m (37 lb ft).


    Object Number: 899634  Size: SH
  19. Install the nuts securing the left catalytic converter to the exhaust manifold.
  20. Tighten
    Tighten the nuts to 50 N·m (37 lb ft).

  21. Lower the vehicle.

  22. Object Number: 856643  Size: SH
  23. Remove the caps from the fuel rail and EVAP pipes.
  24. Connect the EVAP canister purge pipe (3). Refer to Plastic Collar Quick Connect Fitting Service
  25. Connect the fuel feed and return pipes (1) at the fuel rail. Refer to Metal Collar Quick Connect Fitting Service .
  26. Install the fuel fill cap.
  27. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection in Engine Electrical.
  28. Use the following procedure to inspect for leaks:
  29. 19.1. Turn the ignition ON, with the engine OFF, for 2 seconds.
    19.2. Turn the ignition OFF for 10 seconds.
    19.3. Turn the ignition ON, with the engine OFF.
    19.4. Inspect for leaks.