GM Service Manual Online
For 1990-2009 cars only

Evaporative Emission Hoses/Pipes Replacement - Engine/Chassis Pickup

Removal Procedure

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


    Object Number: 1238587  Size: SH
  1. Relieve the fuel system pressure. Refer to Fuel Pressure Relief .
  2. Disconnect the fuel feed line (1) at the engine. Refer to Metal Collar Quick Connect Fitting Service .
  3. Disconnect the EVAP canister purge tube line (2).
  4. Cap the fuel rail in order to avoid possible system contamination.
  5. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle .

  6. Object Number: 1238747  Size: SH
  7. Remove the fuel pipe bracket nut.
  8. Remove the fuel pipe bracket from the bellhousing stud.

  9. Object Number: 1549622  Size: SH
  10. Remove the fuel line clip from the bracket on the transmission.
  11. If equipped with 4-wheel drive (4WD), remove the fuel line clip from the bracket on the transfer case.

  12. Object Number: 1238591  Size: SH
  13. Disconnect the fuel and EVAP quick connect fittings. Refer to Plastic Collar Quick Connect Fitting Service .
  14. Cap the fuel and EVAP lines at the fuel tank in order to avoid possible system contamination.

  15. Object Number: 1228114  Size: SH
  16. Remove the fuel and EVAP bundle nuts.
  17. Remove the fuel and EVAP bundle.

Installation Procedure

    Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 1228114  Size: SH
  1. Install the fuel and EVAP bundle.
  2. Install the fuel and EVAP bundle nuts.
  3. Tighten
    Tighten the nuts to 12 N·m (106 lb in).


    Object Number: 1238591  Size: SH
  4. Remove the caps from the fuel and EVAP lines at the fuel tank.
  5. Connect the fuel and EVAP quick connect fittings. Refer to Plastic Collar Quick Connect Fitting Service .

  6. Object Number: 1549622  Size: SH
  7. If equipped with 4WD, install the fuel line clip to the bracket on the transfer case.
  8. Install the fuel line clip(s) to the bracket(s) on the transmission.

  9. Object Number: 1238747  Size: SH
  10. Install the fuel pipe bracket to the bellhousing stud.
  11. Install the fuel pipe bracket nut.
  12. Tighten
    Tighten the nut to 10 N·m (89 lb in).


    Object Number: 1238587  Size: SH
  13. Lower the vehicle.
  14. Remove the cap from the fuel rail.
  15. Connect the fuel feed line (1) at the engine. Refer to Metal Collar Quick Connect Fitting Service .
  16. Connect the EVAP canister purge tube line (2).
  17. Install the fuel fill cap.
  18. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .
  19. Use the following procedure in order to inspect for leaks:
  20. 15.1. Turn the ignition ON, with the engine OFF, for 2 seconds.
    15.2. Turn the ignition OFF for 10 seconds.
    15.3. Turn the ignition ON, with the engine OFF.
    15.4. Inspect for fuel leaks.

Evaporative Emission Hoses/Pipes Replacement - Engine/Chassis Cab/Chassis

Removal Procedure

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


    Object Number: 1228187  Size: SH
  1. Relieve the fuel system pressure. Refer to Fuel Pressure Relief .
  2. Disconnect the fuel feed and pressure balance lines from the front tank. Refer to Metal Collar Quick Connect Fitting Service .
  3. Cap the fuel and balance lines at the fuel tank in order to avoid possible system contamination.

  4. Object Number: 1228189  Size: SH
  5. Disconnect the fuel feed and pressure balance lines from the rear tank. Refer to Metal Collar Quick Connect Fitting Service .
  6. Cap the fuel and balance lines at the fuel tank in order to avoid possible system contamination.

  7. Object Number: 1228198  Size: SH
  8. Remove the rear fuel line bundle clip nuts.
  9. Remove the rear fuel line bundle.

Installation Procedure


    Object Number: 1228198  Size: SH
  1. Install the rear fuel line bundle.
  2. Install the rear fuel line bundle clip nuts.

  3. Object Number: 1228189  Size: SH
  4. Remove the caps from the fuel and balance lines at the fuel tank.
  5. Connect the fuel feed and pressure balance lines from the rear tank. Refer to Metal Collar Quick Connect Fitting Service .

  6. Object Number: 1228187  Size: SH
  7. Remove the caps from the fuel and balance lines at the fuel tank.
  8. Connect the fuel feed and pressure balance lines from the front tank. Refer to Metal Collar Quick Connect Fitting Service .
  9. Install the fuel fill cap.
  10. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .
  11. Perform the following procedure in order to inspect for leaks.
  12. 9.1. Turn the ignition ON, with the engine OFF, for 2 seconds.
    9.2. Turn the ignition OFF for 10 seconds.
    9.3. Turn the ignition ON, with the engine OFF.
    9.4. Inspect for fuel leaks.