GM Service Manual Online
For 1990-2009 cars only

Evaporative Emission System Hoses/Pipes Replacement 2500 LWB - 98.4L (26 gal) Tank-Front

Removal Procedure

Important: Clean all fuel and evaporative emission (EVAP) line connections and surrounding areas prior to disconnecting the lines in order to avoid possible fuel and/or EVAP system contamination.


    Object Number: 1705654  Size: SH
  1. Remove the fuel tank. Refer to Fuel Tank Replacement .
  2. Remove the fuel tank shield retainers (1) and shield (2).

  3. Object Number: 1705656  Size: SH
  4. Remove the EVAP line from the fuel tank clip (1).
  5. Open the fuel tank clips (2-7) and remove the fuel/EVAP lines from the clips.
  6. Disconnect the fuel/EVAP line quick connect fittings from the fuel tank module. Refer to Plastic Collar Quick Connect Fitting Service .

  7. Object Number: 1705659  Size: SH
  8. Remove the fuel/EVAP lines from the fuel tank.

Installation Procedure


    Object Number: 1705659  Size: SH
  1. Install the fuel/EVAP lines to the fuel tank.

  2. Object Number: 1705656  Size: SH
  3. Connect the fuel/EVAP line quick connect fittings at the fuel tank module. Refer to Plastic Collar Quick Connect Fitting Service .
  4. Install the fuel/EVAP lines to the fuel tank clips (2-7) and close the clips.
  5. Install the fuel/EVAP line to the fuel tank clip (1).

  6. Object Number: 1705654  Size: SH
  7. Install the fuel tank shield (2) and retainers (1).
  8. Install the fuel tank. Refer to Fuel Tank Replacement .

Evaporative Emission System Hoses/Pipes Replacement 2500 LWB - Intermediate

Removal Procedure

Important: Clean all fuel and evaporative emission (EVAP) line connections and surrounding areas prior to disconnecting the lines in order to avoid possible fuel and/or EVAP system contamination.


    Object Number: 1704585  Size: SH
  1. Relieve the fuel system pressure. Refer to Plastic Collar Quick Connect Fitting Service .
  2. Remove the spare tire stowage lock cylinder.
  3. Remove the spare tire.
  4. Drain the rear fuel tank. Refer to Fuel Tank Draining .
  5. Remove the rear exhaust insulator.

  6. Object Number: 1705750  Size: SH
  7. Remove the spare tire hoist crossmember bolts and crossmember.

  8. Object Number: 1372543  Size: SH
  9. Disconnect the rear fuel tank EVAP line quick connect fittings from the EVAP canister. Refer to Plastic Collar Quick Connect Fitting Service .

  10. Object Number: 1372710  Size: SH
  11. Disconnect the fuel and EVAP intermediate line quick connect fittings from the front tank lines. Refer to Plastic Collar Quick Connect Fitting Service .

  12. Object Number: 1372719  Size: SH
  13. Disconnect the chassis harness electrical connector (1) from the fuel pressure sensor.

  14. Object Number: 1224381  Size: SH
  15. Support the fuel tank with a suitable jack.
  16. Remove the fuel tank strap bolts.
  17. Notice: Refer to Damage to Fuel Tank Straps Notice in the Preface section.

  18. Remove the fuel tank straps.
  19. With the aid of an assistant, lower the rear tank until the intermediate line connections can be reached.

  20. Object Number: 1705751  Size: SH
  21. Disconnect the fuel and EVAP intermediate line quick connect fittings from the rear tank. Refer to Plastic Collar Quick Connect Fitting Service .

  22. Object Number: 1224396  Size: SH
  23. Remove the fuel and EVAP intermediate line assembly.
  24. Cap the fuel and EVAP lines in order to prevent possible EVAP/fuel system contamination.

Installation Procedure


    Object Number: 1224396  Size: SH
  1. Remove the caps from the fuel and EVAP lines.
  2. Install the fuel and EVAP intermediate lines.

  3. Object Number: 1705751  Size: SH
  4. Connect the fuel and EVAP intermediate line quick connect fittings to the rear tank. Refer to Plastic Collar Quick Connect Fitting Service .

  5. Object Number: 1224381  Size: SH
  6. With the aid of an assistant, completely raise the rear tank.
  7. Install the fuel tank straps.
  8. Notice: Refer to Fastener Notice in the Preface section.

  9. Install the fuel tank strap bolts.
  10. Tighten
    Tighten the bolts to 40 N·m (30 lb ft).

  11. Remove the adjustable jack from under the fuel tank.

  12. Object Number: 1372719  Size: SH
  13. Connect the chassis harness electrical connector (1) to the fuel pressure sensor.

  14. Object Number: 1372710  Size: SH
  15. Connect the fuel and EVAP intermediate line quick connect fittings to the front tank lines. Refer to Plastic Collar Quick Connect Fitting Service .

  16. Object Number: 1372543  Size: SH
  17. Connect the rear tank EVAP line quick connect fittings to the EVAP canister. Refer to Plastic Collar Quick Connect Fitting Service .

  18. Object Number: 1705750  Size: SH
  19. Install the spare tire hoist crossmember and bolts.
  20. Tighten
    Tighten the bolts to 50 N·m (37 lb ft).


    Object Number: 1704585  Size: SH
  21. Install the rear exhaust insulator.
  22. Install the spare tire.
  23. Install the spare tire stowage lock cylinder.

  24. Object Number: 300318  Size: SH
  25. Install the fuel tank filler housing.
  26. Install the fuel tank filler housing to fuel tank fill pipe bolts.
  27. Tighten
    Tighten the bolts to 2.3 N·m (20 lb in).


    Object Number: 853731  Size: SH
  28. Install the fuel tank filler housing to body TORX® screws (1) and retainer (2).
  29. Tighten
    Tighten the screws to 2.3 N·m (20 lb in).

  30. Refill the fuel tank.
  31. Install the fuel fill cap.
  32. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .
  33. Use the following procedure in order to inspect for leaks:
  34. 21.1. Turn the ignition ON, with the engine OFF, for 2 seconds.
    21.2. Turn the ignition OFF for 10 seconds.
    21.3. Turn the ignition ON, with the engine OFF.
    21.4. Inspect for fuel leaks.
  35. Install the intake manifold sight shield. Refer to Upper Intake Manifold Sight Shield Replacement .