GM Service Manual Online
For 1990-2009 cars only

Fuel Tank Replacement LWB SWB

Removal Procedure

Tools Required

EN-48536 Frame Support Tool (Engine Lower 65 mm Kit)

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

    Caution: Refer to Safety Glasses Caution in the Preface section.

    Caution: Refer to Vehicle Lifting Caution in the Preface section.

  1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
  2. Drain the fuel tank. Refer to Fuel Tank Draining .
  3. Relieve the fuel system pressure. Refer to Fuel Pressure Relief .
  4. Remove the exhaust system. Refer to Exhaust System Replacement .
  5. Remove the propeller shaft. Refer to Propeller Shaft Replacement .
  6. Remove the right rear wheel. Refer to Tire and Wheel Removal and Installation .

  7. Object Number: 1949829  Size: SH
  8. Disconnect the evaporative emission (EVAP) line (1), by squeezing both sides of the line (as indicated in the illustration) and pulling it toward the rear of the vehicle.

  9. Object Number: 1949831  Size: SH
  10. Release the worm drive hose clamp (1) and remove the filler tube (2).

  11. Object Number: 1949815  Size: SH
  12. Disconnect the fuel feed line (1) and evaporative emission (EVAP) line (2). Refer to Plastic Collar Quick Connect Fitting Service .

  13. Object Number: 1949816  Size: SH
  14. Disconnect the fuel tank electrical connector (1).

  15. Object Number: 1949823  Size: SH
  16. Support the rear frame assembly using a suitable tool.

  17. Object Number: 1949819  Size: SH
  18. Remove the rear frame to chassis retaining bolts (1) and (2) and discard.

  19. Object Number: 1949825  Size: SH
  20. Support the rear frame using the bolt (1) from the EN-48536 special tool kit . Repeat for the opposite side.

  21. Object Number: 1949827  Size: SH

    Important:  When lowering the rear frame use care not to over extend the rear brake hoses.

  22. Support the rear frame using the bolt (1) from the EN-48536 special tool kit . Repeat for the opposite side.
  23. Lower the rear frame approximately 50 millimetre's (2 in) (A) at the rear mounting surface between the rear frame and the chassis.
  24. This will allow clearance to access the fuel tank strap bolts.
  25. Remove the fuel tank heat shield. Refer to Fuel Tank Heat Shield Replacement .
  26. Disconnect the park brake rear cables from the park brake front cable equalizer bracket assembly. Refer to Parking Brake Front Cable Replacement .

  27. Object Number: 2008604  Size: SH
  28. Disconnect the evapouritive emission line (2) from the evapourative emission canister (3). Refer to Plastic Collar Quick Connect Fitting Service .

  29. Object Number: 1949817  Size: SH
  30. Remove the fuel tank strap to chassis retaining bolts (1).
  31. Position the fuel tank straps away from the fuel tank.
  32. Carefully bend the fuel tank straps enough to allow the fuel tank to be removed.
  33. Important: Make sure the following are free from the surrounding components while lowering the fuel tank:

       • The fuel tank wiring harness.
       • The fuel hoses at the chassis pipes.

  34. With the aid of an assistant, carefully lower the fuel tank from the vehicle.
  35. Remove the following components if replacing just the fuel tank.
  36. • 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 .

    Important: Make sure the following are properly routed while raising the fuel tank:

       • The fuel tank wiring harness.
       • The fuel hoses at the chassis pipes.


    Object Number: 1949817  Size: SH
  3. With the aid of an assistant, carefully raise the fuel tank to the vehicle.
  4. Important: Make sure the fuel tank straps are not pressed into the fuel tank.

  5. Carefully install the fuel tank straps back to their original form.
  6. Position the fuel tank straps around the rear frame and upward into position, aligning the holes in the straps with the threaded holes in the chassis.
  7. Notice: Refer to Fastener Notice in the Preface section.

  8. Install the fuel tank strap bolts.
  9. Tighten
    Tighten the fuel tank strap bolts to 20 N·m (15 lb ft).


    Object Number: 2008604  Size: SH
  10. Connect the evapourative emission line (2) to the evapourative emission canister (3). Refer to Plastic Collar Quick Connect Fitting Service .

  11. Object Number: 1949823  Size: SH
  12. Raise the rear frame assembly using suitable tool.

  13. Object Number: 2008605  Size: SH
  14. Remove the special tool EN-48536 bolt (1) from the rear frame. Repeat for the opposite side.

  15. Object Number: 2008606  Size: SH
  16. Remove the special tool EN-48536 bolt (1) from the rear frame. Repeat for the opposite side.
  17. Using a suitable tool clean the threaded holes in the rear chassis.

  18. Object Number: 1949819  Size: SH

    Important: Rear frame retaining bolts must not to be fully tightened at this stage.

  19. Install the NEW rear frame to chassis retaining bolts (2).
  20. Do not fully tighten at this stage.

  21. After retaining bolts (1 and 2) are installed tighten to.
  22. Tighten

        • First Pass: Tighten the bolts to 65 N·m (48 lb ft)
        • Final Pass: Tighten the bolts a further 125  degrees.

    Object Number: 1949823  Size: SH
  23. Remove the support tool.

  24. Object Number: 1949816  Size: SH
  25. Connect the fuel tank electrical connector (1).

  26. Object Number: 1949815  Size: SH
  27. Refer to Plastic Collar Quick Connect Fitting Service , in order to connect the following to the chassis bundle:
  28. • The fuel feed line
    • The fuel EVAP hose

    Object Number: 1949829  Size: SH
  29. Install the evaporative emission (EVAP) line (1), listen for an audible click to confirm fitting.

  30. Object Number: 1949831  Size: SH
  31. Connect the filler hose (2) to the fuel tank.
  32. Tighten
    Tighten the fuel filler tube hose clamp (1) to 4 N·m (35 lb in).

  33. Connect the park brake rear cables to the park brake front cable equalizer bracket assembly. Refer to Parking Brake Front Cable Replacement .
  34. Install the propeller shaft. Refer to Propeller Shaft Replacement .
  35. Install the exhaust system. Refer to Exhaust System Replacement .
  36. Install the right rear wheel. Refer to Tire and Wheel Removal and Installation .
  37. Refill the fuel tank.
  38. Inspect for fuel leaks.