GM Service Manual Online
For 1990-2009 cars only

Fuel Tank Replacement Extended Cab - Side Tank

Removal Procedure

  1. Drain the fuel from the tank. Refer to Fuel Tank Draining .
  2. Raise the vehicle.

  3. Object Number: 18442  Size: SH
  4. Loosen the filler neck hose clamp at the fuel tank and disconnect the fuel tank filler neck from the fuel tank.

  5. Object Number: 18413  Size: SH
  6. Support the fuel tank and remove the tank straps and insulator strips, if equipped.

  7. Object Number: 18414  Size: SH
  8. Lower the fuel tank shield.

  9. Object Number: 18415  Size: SH
  10. With the aid of an assistant lower the fuel tank enough to gain access to the fuel lines and electrical connectors..

  11. Object Number: 19204  Size: SH
  12. Disconnect the fuel feed and vapor hoses.
  13. Disconnect the electrical connections at the sender.

  14. Object Number: 65287  Size: SH
  15. Remove the fuel sender assembly and seal ring, using tool J 39765 . Discard the old seal ring.

Installation Procedure


    Object Number: 65287  Size: SH
  1. Install the new seal ring and reinstall the sender using tool J 39765 .

  2. Object Number: 19204  Size: SH
  3. with the aid of an assistant raise the tank enough to allow for reconnection of the fuel feed and vapor hoses and the electrical connections at the sender.

  4. Object Number: 18415  Size: SH
  5. Raise the tank fully.

  6. Object Number: 18414  Size: SH
  7. Install the fuel tank shield.

  8. Object Number: 18442  Size: SH
  9. Reinstall the fuel tank filler neck to the tank. Tighten the clamp.

  10. Object Number: 18413  Size: SH

    Notice: Tighten the strap fasteners by steps, alternating between the fasteners, until the specified torque is reached. A failure to tighten the strap fasteners as specified will cause the bottom of the tank to flex upward. This will result in the fuel gauge indicating that there is fuel remaining in the tank when the tank is empty.

    Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  11. Install the fuel tank brackets with insulator strips in place.
  12. Important: When removing or replacing the fuel tank, the fuel tank support fasteners should never be reused. Always use new fasteners when installing the fuel tank.

    Tighten
    Tighten the fuel tank strap nuts to 13 N·m (115 lb in).

  13. Replenish the fuel in the tank. Reinstall the fuel tank filler cap.
  14. Reconnect the negative battery cable. If a memory retention device was not used, please reset (to the extent possible) all devices that lost their memory after the battery was disconnected.
  15. Check for fuel leaks.
  16. 9.1. Turn ON the ignition switch for 2 seconds.
    9.2. Turn OFF the ignition switch for 10 seconds.
    9.3. Again, turn the ignition switch to the ON position.
    9.4. Check for fuel leaks.

Fuel Tank Replacement Pick-up-Side Tank

Removal Procedure

  1. Drain the fuel from the tank. Refer to Fuel Tank Draining .
  2. Raise the vehicle.

  3. Object Number: 18442  Size: SH
  4. Loosen the filler neck hose clamp at the fuel tank and disconnect the fuel tank filler neck from the fuel tank.

  5. Object Number: 18407  Size: SH
  6. Support the fuel tank and remove the tank straps and insulator strips, if equipped.

  7. Object Number: 18406  Size: SH
  8. Remove the frame mounted bracket.

  9. Object Number: 18408  Size: SH
  10. Lower the fuel tank shield.

  11. Object Number: 18409  Size: SH
  12. With the aid of an assistant lower the fuel tank enough to allow access to the fuel lines and electrical connectors.

  13. Object Number: 19204  Size: SH
  14. Disconnect the fuel feed and vapor hoses. Disconnect the electrical connections at the sender.

  15. Object Number: 65287  Size: SH
  16. Remove the fuel sender assembly and seal ring, using tool J 39765 . Discard the old seal ring.

Installation Procedure


    Object Number: 65287  Size: SH
  1. Install the new seal ring and reinstall the sender using tool J 39765 .

  2. Object Number: 19204  Size: SH
  3. With the aid of an assistant raise the tank enough to allow for the reconnection of the the fuel feed and vapor hoses and the electrical connections at the sender.

  4. Object Number: 18409  Size: SH
  5. Raise the tank fully.

  6. Object Number: 18408  Size: SH
  7. Install the fuel tank shield.

  8. Object Number: 18442  Size: SH
  9. Reinstall the fuel tank filler neck to the tank. Tighten the clamp.

  10. Object Number: 18406  Size: SH
  11. Install the frame mounted bracket.

  12. Object Number: 18407  Size: SH

    Notice: Tighten the strap fasteners by steps, alternating between the fasteners, until the specified torque is reached. A failure to tighten the strap fasteners as specified will cause the bottom of the tank to flex upward. This will result in the fuel gauge indicating that there is fuel remaining in the tank when the tank is empty.

    Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  13. Install the fuel tank brackets with insulator strips in place.
  14. Important: When removing or replacing the fuel tank, the fuel tank support fasteners should never be reused. Always use new fasteners when installing the fuel tank.

    Tighten
    Tighten the fuel tank strap nuts to 13 N·m (115 lb in).

  15. Replenish the fuel in the tank. Reinstall the fuel tank filler cap.
  16. Reconnect the negative battery cable. If a memory retention device was not used, please reset (to the extent possible) all devices that lost their memory after the battery was disconnected.
  17. Check for fuel leaks.
  18. 10.1. Turn ON the ignition switch for 2 seconds.
    10.2. Turn OFF the ignition switch for 10 seconds.
    10.3. Again, turn the ignition switch to the ON position.
    10.4. Check for fuel leaks.

Fuel Tank Replacement Cab and Chassis - Side Tank

Removal Procedure

  1. Drain the fuel from the tank. Refer to Fuel Tank Draining .
  2. Raise the vehicle.

  3. Object Number: 18440  Size: SH
  4. Loosen the filler neck hose clamp at the fuel tank and disconnect the fuel tank filler neck from the fuel tank.

  5. Object Number: 18418  Size: SH
  6. Support the fuel tank and remove the tank straps and insulator strips, if equipped.

  7. Object Number: 18419  Size: SH
  8. With the aid of an assistant lower the fuel tank shield.

  9. Object Number: 18420  Size: SH
  10. Lower the fuel tank.

  11. Object Number: 19204  Size: SH
  12. Disconnect the fuel feed and vapor hoses.
  13. Disconnect the electrical connections at the sender.

  14. Object Number: 65287  Size: SH
  15. Remove the fuel sender assembly and seal ring, using tool J 39765 . Discard the old seal ring.

Installation Procedure


    Object Number: 65287  Size: SH
  1. Install the new seal ring and reinstall the sender using tool J 39765 .

  2. Object Number: 19204  Size: SH
  3. With the aid of an assistant raise the tank to allow for the reconnection of the fuel feed and vapor hoses and the electrical connections at the sender.

  4. Object Number: 18420  Size: SH
  5. Raise the tank fully.

  6. Object Number: 18419  Size: SH
  7. Install the fuel tank shield.

  8. Object Number: 18440  Size: SH
  9. Reinstall the fuel tank filler neck to the tank. Tighten the clamp.

  10. Object Number: 18418  Size: SH

    Notice: Tighten the strap fasteners by steps, alternating between the fasteners, until the specified torque is reached. A failure to tighten the strap fasteners as specified will cause the bottom of the tank to flex upward. This will result in the fuel gauge indicating that there is fuel remaining in the tank when the tank is empty.

    Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  11. Install the fuel tank brackets with insulator strips in place.
  12. Important: When removing or replacing the fuel tank, the fuel tank support fasteners should never be reused. Always use new fasteners when installing the fuel tank.

    Tighten
    Tighten the fuel tank strap nuts to 13 N·m (115 lb in).

  13. Replenish the fuel in the tank. Reinstall the fuel tank filler cap.
  14. Reconnect the negative battery cable. If a memory retention device was not used, please reset (to the extent possible) all devices that lost their memory after the battery was disconnected.
  15. Check for fuel leaks.
  16. 9.1. Turn ON the ignition switch for 2 seconds.
    9.2. Turn OFF the ignition switch for 10 seconds.
    9.3. Again, turn the ignition switch to the ON position.
    9.4. Check for fuel leaks.

Fuel Tank Replacement Cab and Chassis - Rear Tank

Removal Procedure

  1. Drain the fuel from the tank. Refer to Fuel Tank Draining .
  2. Raise the vehicle.

  3. Object Number: 18426  Size: SH
  4. Remove the fuel tank off-road shield, if equipped.

  5. Object Number: 18440  Size: SH
  6. Loosen the filler neck hose clamp at the fuel tank and disconnect the fuel tank filler neck from the fuel tank.

  7. Object Number: 18424  Size: SH
  8. Support the fuel tank and remove the tank straps and insulator strips, if equipped.

  9. Object Number: 18425  Size: SH
  10. with the aid of an assistant lower the fuel tank.
  11. Disconnect the fuel feed and vapor hoses.
  12. Disconnect the electrical connections at the sender.

  13. Object Number: 65287  Size: SH
  14. Remove the fuel sender assembly and seal ring, using tool J 39765 . Discard the old seal ring. Purge the tank, if the tank is being repaired.

Installation Procedure


    Object Number: 65287  Size: SH
  1. Install the new seal ring and reinstall the sender using tool J 39765 .
  2. With the aid of an assistant raise the tank enoght to allow for the reconnection of the fuel feed and vapor hoses and the electrical connections at the sender.

  3. Object Number: 18425  Size: SH
  4. Raise the tank fully.

  5. Object Number: 18440  Size: SH
  6. Reinstall the fuel tank filler neck to the tank. Tighten the clamp.

  7. Object Number: 18424  Size: SH

    Notice: Tighten the strap fasteners by steps, alternating between the fasteners, until the specified torque is reached. A failure to tighten the strap fasteners as specified will cause the bottom of the tank to flex upward. This will result in the fuel gauge indicating that there is fuel remaining in the tank when the tank is empty.

    Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  8. Install the fuel tank brackets with insulator strips in place.
  9. Important: When removing or replacing the fuel tank, the fuel tank support fasteners should never be reused. Always use new fasteners when installing the fuel tank.

    Tighten
    Tighten the strap nuts to 35 N·m (47 lb ft).


    Object Number: 18426  Size: SH
  10. Install the fuel tank off-road shield, if equipped.
  11. Replenish the fuel in the tank. Reinstall the fuel tank filler cap.
  12. Reconnect the negative battery cable. If a memory retention device was not used, please reset (to the extent possible) all devices that lost their memory after the battery was disconnected.
  13. Check for fuel leaks.
  14. 9.1. Turn ON the ignition switch for 2 seconds.
    9.2. Turn OFF the ignition switch for 10 seconds.
    9.3. Again, turn the ignition switch to the ON position.
    9.4. Check for fuel leaks.