Fuel Tank Replacement (NU6)

Fuel Tank Replacement (NU6)

Removal Procedure

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




1. Relieve the fuel system fuel pressure. Refer to Fuel Pressure Relief (With CH 48027) (Fuel Pressure Relief (With CH 48027)) Fuel Pressure Relief (Without CH 48027) (Fuel Pressure Relief (Without CH 48027)).
2. Drain the fuel tank. Refer to Fuel Tank Draining (LZE) (Procedures) Fuel Tank Draining (With E-85) (Procedures) Fuel Tank Draining (LZ4) (Procedures).
3. Raise and support the vehicle. Refer to Vehicle Lifting (Service and Repair).
4. Loosen the fuel fill hose clamp (1) at the fuel tank.
5. Remove the fuel tank fill hose (2) from the fuel tank (3).
6. Disconnect the EVAP vent pipe quick connect fitting from the fill pipe EVAP vent pipe quick connect fitting. Plastic Collar Quick Connect Fitting Service (Plastic Collar Quick Connect Fitting Service).




7. Disconnect the EVAP vent solenoid hose on the tank from the vent valve solenoid hose.




8. Disconnect the fuel feed (3), and the EVAP (4) lines from the fuel tank lines (1, 2). Refer to Plastic Collar Quick Connect Fitting Service (Plastic Collar Quick Connect Fitting Service).
9. Support the exhaust system.
10. Remove the rubber exhaust pipe hangers in order to allow the exhaust system to drop slightly.




11. Remove the fuel tank shield retainers (3).
12. Remove the fuel tank shield (2).





Caution: Do not bend the fuel tank straps. Bending the fuel tank straps may damage the straps.

13. Support the fuel tank with a suitable adjustable jack.
14. Remove the fuel tank strap bolts (3).
15. Using the jack lower the fuel tank.




16. Disconnect the fuel tank wiring harness electrical connector from the underbody connector.
17. Remove the fuel tank and place the tank in a suitable work area.





Note: Note the routing of the lines for installation.

18. Disconnect the EVAP line (1) quick connect fittings from the fuel tank module and the EVAP canister. Refer to Plastic Collar Quick Connect Fitting Service (Plastic Collar Quick Connect Fitting Service).
19. Remove the EVAP line assembly (1).
20. Disconnect the fuel feed line (2) from the fuel tank module. Refer to Plastic Collar Quick Connect Fitting Service (Plastic Collar Quick Connect Fitting Service).
21. Disengage the fuel feed line from the retaining feature (3) built into the fuel tank and remove the fuel line (2).




22. Disconnect the fuel tank wiring harness (1) electrical connectors from the fuel tank module and the fuel pressure sensor.
23. Remove the EVAP canister. Refer to Evaporative Emission Canister Replacement (NU6) (Evaporative Emission Canister Replacement (NU6)) Evaporative Emission Canister Replacement (NC7) (Evaporative Emission Canister Replacement (NC7)).
24. Remove the insulator pads from the fuel tank. Note the location of the insulator pads for installation.

Installation Procedure

Caution:
* Do not attempt to straighten kinked nylon pipes. Replace any kinked nylon pipes in order to prevent damage to the vehicle.
* Do not attempt to repair sections of nylon pipes. Replace damaged nylon pipes.
* Replace the vapor pipes with original equipment or parts that meet GM specifications.
* Replace the vapor hoses with original equipment or parts meeting GM specifications. Use only reinforced fuel-resistant hose identified with the word Fluoroelastomer or GM 6163M on the hose.




1. Install the insulator pads to the fuel tank.
2. Install the EVAP canister. Refer to Evaporative Emission Canister Replacement (NU6) (Evaporative Emission Canister Replacement (NU6)) Evaporative Emission Canister Replacement (NC7) (Evaporative Emission Canister Replacement (NC7)).
3. Connect the fuel tank wiring harness (1) electrical connectors to the fuel tank module and the fuel pressure sensor.




4. Install and connect the fuel feed line (2) to the fuel tank module. Refer to Plastic Collar Quick Connect Fitting Service (Plastic Collar Quick Connect Fitting Service).
5. Engage the fuel feed line to the retaining feature (3) built into the fuel tank.
6. Install and connect the EVAP line (1) quick connect fittings to the fuel tank module and the EVAP canister. Refer to Plastic Collar Quick Connect Fitting Service (Plastic Collar Quick Connect Fitting Service).
7. Install the fuel tank onto a suitable jack.
8. Partially raise the fuel tank until the electrical connection can be made.




9. Connect the fuel tank wiring harness electrical connector to the underbody connector.




10. Completely raise the tank.

Caution: Refer to Fastener Caution (Fastener Caution).

11. Install the fuel tank strap bolts (3).

Tighten the bolts to 48 Nm (35 lb ft).

12. Remove the jack from the fuel tank.




13. Position the fuel tank shield (2) to the fuel tank.
14. Install the shield retainers (3).




15. Install the rubber exhaust pipe hangers.
16. Remove the support from the exhaust system.
17. Connect the fuel feed (3), and EVAP (4) lines to the fuel tank lines (1, 2). Refer to Plastic Collar Quick Connect Fitting Service (Plastic Collar Quick Connect Fitting Service).




18. Connect the EVAP vent solenoid hose on the tank to the EVAP vent valve solenoid hose.




19. Connect the EVAP vent pipe quick connect fitting to the fill pipe EVAP vent pipe quick connect fitting. Refer to Plastic Collar Quick Connect Fitting Service (Plastic Collar Quick Connect Fitting Service).
20. Install the fuel tank fill hose (2) onto the fuel tank (3). Install the hose over the orientation feature (4) on the tank, until fully seated to the tank.
21. Tighten the fuel fill hose clamp (1) at the fuel tank.

Tighten the clamp to 2.5 Nm (22 lb in).

22. Lower the vehicle.
23. Add fuel and install the fuel fill cap.
24. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection (RPOs LZE/LZ4/LGD) (Battery Negative Cable Disconnection and Connection).
25. Inspect the fuel system for leaks by performing the following steps:

1. Turn ON the ignition for 2 seconds.
2. Turn OFF the ignition for 10 seconds.
3. Turn ON the ignition.
4. Inspect for fuel leaks.

26. Install the intake manifold cover. Refer to Intake Manifold Cover Replacement (Intake Manifold Cover Replacement).