Fuel Tank Replacement Suburban

Removal Procedure

Tools Required

J 39765 Fuel Sender Locknut Wrench.

Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

1. Disconnect the negative battery cable.
2. Drain the fuel from the tank. Refer to Fuel Tank Draining Procedure .
3. Raise the vehicle.



4. Remove the fuel tank off-road shield, if equipped.



5. Loosen the filler neck hose clamp at the fuel tank and disconnect the fuel tank filler neck from the fuel tank.



6. Support the fuel tank and remove the tank straps and insulator strips, if equipped.



7. Lower the fuel tank shield.



8. Lower the fuel tank. Disconnect the fuel feed and vapor hoses. Disconnect the electrical connections at the sender.



9. Remove the fuel sender assembly and seal ring, using tool J 39765 . Discard the old seal ring.

Installation Procedure

1. Install the new seal ring and reinstall the sender using tool J 39765 .
2. Raise the tank slightly and reconnect the fuel feed and vapor hoses and the electrical connections at the sender.



3. Completely raise the fuel tank.

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.

4. Install the fuel tank straps and fastening hardware.



5. Reinstall the fuel tank filler neck to the tank. Tighten the clamp.




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.

6. Install the fuel tank straps with insulator strips in place.

Install the fuel tank strap bolts.

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




7. Install the fuel tank off-road shield, if equipped.
8. Replenish the fuel in the tank. Reinstall the fuel tank filler cap.
9. 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.
10. Check for leaks.

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 Tahoe/Yukon

Removal Procedure

Tools Required

J 39765 fuel sender locknut wrench.

Caution: Provide additional support when a vehicle is on a hoist in the following ways:

•	Before removing major components, chain the vehicle frame to the hoist pads at the same end as the removal. This helps avoid a tip-off.

Failure to follow these precautions could cause vehicle damage, serious personal injury, or death.

Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

1. Disconnect the negative battery cable.
2. Drain the fuel from the tank. Refer to Fuel Tank Draining Procedure .
3. Relieve the fuel system pressure. Refer to Fuel Tank Draining Procedure
4. Raise the vehicle.



5. Loosen the filler neck hose clamp at the fuel tank and disconnect the fuel tank filler neck from the fuel tank.



6. Support the fuel tank and loosen the tank straps and remove insulator strips, if equipped.



7. With the aid of an assistant lower and support the fuel tank and shield.
8. Clean all fuel pipe connections and surrounding areas before disconnecting the fuel pipes in order to avoid possible contamination of the fuel system. Disconnect the fuel feed and vapor hoses.
9. Disconnect the electrical connections at the sender.
10. Remove the fuel tank straps.
11. Remove the fuel tank and place in a suitable work area.



12. Remove the fuel sender assembly and seal ring, using tool J 39765 . Discard the old seal ring.

Installation Procedure

1. Install the new seal ring and reinstall the sender using tool J 39765 .
2. With the aid of an assistant, raise and support the tank to allow reconnection of the fuel feed and vapor hoses and the electrical connections at the sender.



3. Raise the tank fully.
4. Install the fuel tank straps and fastening hardware.

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.




5. Reinstall the fuel tank filler neck to the tank. Tighten the clamp.




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.

6. Install the fuel tank straps with insulator strips in place.

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




7. Install the fuel tank off-road shield, if equipped.
8. Replenish the fuel in the tank. Reinstall the fuel tank filler cap.
9. 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.
10. Check for fuel leaks.

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 Extended Cab - Side Tank

Removal Procedure

Tools Required

J 39765 fuel sender locknut wrench.

Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

1. Disconnect the negative battery cable.
2. Drain the fuel from the tank. Refer to Fuel Tank Draining Procedure .
3. Raise the vehicle.



4. Loosen the filler neck hose clamp at the fuel tank and disconnect the fuel tank filler neck from the fuel tank.



5. Support the fuel tank and remove the tank straps and insulator strips, if equipped.



6. Lower the fuel tank shield.



7. Lower the fuel tank.



8. Disconnect the fuel feed (1) and vapor (2) hoses.
9. Disconnect the electrical connections at the sender.



10. Remove the fuel sender assembly and seal ring, using tool J 39765 . Discard the old seal ring.

Installation Procedure

1. Install the new seal ring and reinstall the sender using tool J 39765 .



2. Raise the tank slightly and reconnect the fuel feed (1) vapor (2) hoses and the electrical connector at the sender.



3. Raise the fuel tank fully.



4. Install the fuel tank shield.
5. Install the fuel tank straps and fastening hardware.

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.




6. Reinstall the fuel tank filler neck to the tank. Tighten the clamp.




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.

7. Install the fuel tank brackets with insulator strips in place.

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

8. Replenish the fuel in the tank. Reinstall the fuel tank filler cap.
9. 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.
10. Check for fuel leaks.

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 Pick-up - Side Tank

Removal Procedure

Tools Required

J 39765 Fuel Sender Locknut Wrench.

Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

1. Disconnect the negative battery cable.
2. Drain the fuel from the tank. Refer to Fuel Tank Draining Procedure .
3. Raise the vehicle.



4. Loosen the filler neck hose clamp at the fuel tank and disconnect the fuel tank filler neck from the fuel tank.



5. Support the fuel tank and remove the tank straps and insulator strips, if equipped.



6. Remove the frame mounted bracket.



7. Lower the fuel tank shield.



8. Lower the fuel tank.



9. Disconnect the fuel feed (1) and vapor (2) hoses. Disconnect the electrical connector at the sender.



10. Remove the fuel sender assembly and seal ring, using tool J 39765 . Discard the old seal ring.

Installation Procedure

1. Install the new seal ring and reinstall the sender using tool J 39765 .



2. Raise the tank slightly and reconnect the fuel feed (1), vapor (2) hoses and the electrical connector at the sender.



3. Raise the fuel tank fully.



4. Install the fuel tank shield.
5. Install the fuel tank straps and fastening hardware.

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.




6. Reinstall the fuel tank filler neck to the tank. Tighten the clamp.



7. Install the frame mounted bracket.

Tighten
Tighten the fasteners to 33 N·m(45 lb ft).





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.

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

9. Replenish the fuel in the tank. Reinstall the fuel tank filler cap.
10. 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.
11. Check for fuel leaks.

11.1.

Turn ON the ignition switch for 2 seconds.

11.2.

Turn OFF the ignition switch for 10 seconds.

11.3.

Again, turn the ignition switch to the ON position.

11.4.

Check for fuel leaks.

Fuel Tank Replacement Cab and Chassis - Side Tank

Removal Procedure

Tools Required

J 39765 fuel sender locknut wrench.

Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

1. Disconnect the negative battery cable.
2. Drain the fuel from the tank. Refer to Fuel Tank Draining Procedure .
3. Raise the vehicle.



4. Loosen the filler neck hose clamp at the fuel tank and disconnect the fuel tank filler neck from the fuel tank.



5. Support the fuel tank and remove the tank straps and insulator strips, if equipped.



6. Lower the fuel tank shield.



7. Lower the fuel tank.



8. Disconnect the fuel feed (1) and vapor (2) hoses.
9. Disconnect the electrical connections at the sender.



10. Remove the fuel sender assembly and seal ring, using tool J 39765 . Discard the old seal ring.

Installation Procedure

1. Install the new seal ring and reinstall the sender using tool J 39765 .



2. Raise the tank slightly and reconnect the fuel feed (1) vapor (2) hoses and the electrical connector at the sender.



3. Raise the fuel tank fully.



4. Install the fuel tank shield.
5. Install the fuel tank straps and fastening hardware with insulator strips in place.

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.




6. Reinstall the fuel tank filler neck to the tank. Tighten the clamp.




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.

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

7. Replenish the fuel in the tank. Reinstall the fuel tank filler cap.
8. 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.
9. Check for fuel leaks.

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 - Rear Tank

Removal Procedure

Tools Required

J 39765 fuel sender locknut wrench.

Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

1. Disconnect the negative battery cable.
2. Drain the fuel from the tank. Refer to Fuel Tank Draining Procedure .
3. Raise the vehicle.



4. Remove the fuel tank off-road shield, if equipped.



5. Loosen the filler neck hose clamp at the fuel tank and disconnect the fuel tank filler neck from the fuel tank.



6. Support the fuel tank and remove the tank straps and insulator strips, if equipped.



7. Lower the fuel tank.
8. Disconnect the fuel feed and vapor hoses.
9. Disconnect the electrical connections at the sender.



10. Remove the fuel sender assembly and seal ring, using tool J 39765 . Discard the old seal ring.

Installation Procedure

1. Install the new seal ring and reinstall the sender using tool J 39765 .
2. Raise the tank slightly and reconnect the fuel feed and vapor hoses and the electrical connections at the sender.



3. Raise the fuel tank fully.
4. Install the fuel tank straps and fastening hardware.

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.




5. Reinstall the fuel tank filler neck to the tank. Tighten the clamp.




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.

6. Install the fuel tank brackets with insulator strips in place.

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




7. Install the fuel tank off-road shield, if equipped.

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.

Tighten
Tighten the fuel tank shield fastening hardware to 74 N·m(102 lb ft).

8. Replenish the fuel in the tank. Reinstall the fuel tank filler cap.
9. 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.
10. Check for fuel leaks.

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.