GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

Warning: Refer to Gasoline/Gasoline Vapors Warning in the Preface section.

  1. Drain the fuel tank. Refer to Fuel Tank Draining.
  2. Relieve the fuel system pressure. Refer to Fuel Pressure Relief.
  3. Remove the exhaust system. Refer to Exhaust System Replacement.
  4. Remove the rear propeller shaft. Refer to Rear Propeller Shaft Replacement.

  5. Object Number: 708181  Size: SH

    Note: Do not remove any components from the rear frame assembly once the rear frame assembly is removed from the vehicle.

  6. Remove the rear frame assembly (2). Refer to Rear Frame Replacement.

  7. Object Number: 785808  Size: SH
  8. Disconnect the filler hose (1) from the fuel tank.
  9. Disconnect the filler vent tube (2) from the evaporative emission (EVAP) hose. Refer to Plastic Collar Quick Connect Fitting Service.

  10. Object Number: 1994076  Size: SH
  11. Disconnect the fuel feed pipe (1) from the chassis bundle. Refer to Plastic Collar Quick Connect Fitting Service.
  12. Disconnect the fuel EVAP hose (2) from the chassis bundle. Refer to Plastic Collar Quick Connect Fitting Service.

  13. Object Number: 801228  Size: SH
  14. Release the electrical connector interlock and disconnect the fuel tank electrical connector.
  15. Remove the fuel tank electrical connector retainer from the chassis.
  16. Remove the fuel tank electrical harness from the chassis mounted retainer.

  17. Object Number: 785817  Size: SH
  18. Disconnect the EVAP hoses from the EVAP canister.
  19. Pull outward on the retainer tab in order to disengage the retainer from the chassis.

  20. Object Number: 1558059  Size: SH
  21. Disconnect the electrical connector from the fuel tank pressure sensor (1).
  22. Disconnect the electrical connector from the EVAP canister vent valve.

  23. Object Number: 785806  Size: SH
  24. Support the fuel tank with a suitable jack.
  25. Remove the fuel tank strap bolts.
  26. Remove the fuel tank straps.
  27. Note: Ensure the following are free from the surrounding components while lowering the fuel tank:

       • The fuel tank wiring harness
       • The EVAP wiring harness
       • The EVAP hoses at the EVAP
       • The fuel/EVAP hoses at the chassis pipes

  28. With the aid of an assistant, carefully lower the fuel tank from the vehicle.
  29. Remove the following components if replacing just the fuel tank:
  30. • The primary fuel tank module--Refer to Primary Fuel Tank Module Replacement.
    • The secondary fuel tank module--Refer to Secondary Fuel Tank Module Replacement.

Installation Procedure

  1. Install the following components if fuel tank replacement was necessary:
  2. • The primary fuel tank module--Refer to Primary Fuel Tank Module Replacement.
    • The secondary fuel tank module--Refer to Secondary Fuel Tank Module Replacement.

    Object Number: 785806  Size: SH

    Note: Ensure the following are properly routed while raising the fuel tank:

       • The fuel tank wiring harness
       • The EVAP wiring harness
       • The EVAP hoses at the EVAP
       • The fuel/EVAP hoses at the chassis pipes

  3. With the aid of an assistant, carefully raise the fuel tank to the vehicle.
  4. Install the fuel tank straps to the vehicle.
  5. Caution: Refer to Fastener Caution in the Preface section.

  6. Install the fuel tank strap bolts and tighten to 50 N·m (37 lb ft).

  7. Object Number: 785808  Size: SH
  8. Connect the filler hose (1) to the fuel tank and tighten to 3.5 N·m (31 lb in).
  9. Connect the filler vent tube (2) to the EVAP hose. Refer to Plastic Collar Quick Connect Fitting Service.

  10. Object Number: 785817  Size: SH
  11. Connect the EVAP hoses to the EVAP canister.
  12. Connect the EVAP purge valve and fuel tank pressure sensor electrical connectors.

  13. Object Number: 801228  Size: SH
  14. Install the fuel tank wire harness and wire harness connector to the retainers on the chassis.
  15. Connect the fuel tank electrical connector, and engage the connector interlock.

  16. Object Number: 1994076  Size: SH
  17. Connect the fuel EVAP hose (2) to the chassis bundle. Refer to Plastic Collar Quick Connect Fitting Service.
  18. Connect the fuel feed pipe (1) to the chassis bundle. Refer to Plastic Collar Quick Connect Fitting Service.

  19. Object Number: 708181  Size: SH
  20. Install the rear frame assembly (2). Refer to Rear Frame Replacement.
  21. Install the propeller shaft. Refer to Rear Propeller Shaft Replacement.
  22. Install the exhaust system. Refer to Exhaust System Replacement.
  23. Refill the fuel tank.
  24. Inspect for fuel leaks.