Rear Pipes

CAUTIONS:
- Replace the EVAP pipes and hoses with the original equipment or parts that meet the GM specifications for those parts. The replacement EVAP pipe must have the same type of fittings as the original pipe in order to ensure the integrity of the connection.
- When replacing EVAP hoses use only reinforced fuel-resistant hose identified with the word Fluoroelastomer or GM 6163-M on the hose. The inside hose diameter must match the outside pipe diameter.
- Do not use rubber hose within 100 mm (4 in) of any part of the exhaust system or within 254 mm (10 in) of the catalytic converter.
- Do not repair the fuel feed or return pipes.
- Replace the fuel feed and return pipes with original equipment or with parts that meet the GM specifications for those parts. The replacement pipe must have the same type of fittings as the original pipe in order to ensure the integrity of the connection.

Description:

REMOVAL PROCEDURE
1. Remove the left fuel tank. Refer to Fuel Tank Replacement (Left w/Auto Trans) or Fuel Tank Replacement (Left w/Manual Trans).
2. Disconnect the fuel sender fuel feed pipe (3) (jet pump to left tank).
3. Disconnect the fuel feed pipe (8) at the fuel filter.
4. Disconnect the fuel feed rear crossover pipe (9) (left tank to jet pump).

Description:

5. Disconnect the fuel return rear pipe (2).
6. Remove the left side rear fuel pipes.
7. Cap the fuel filter inlet.
8. Cap the chassis fuel return pipe.
9. Remove the right fuel tank. Refer to Fuel Tank Replacement (Right w/Auto Trans) or Fuel Tank Replacement (Right w/Manual Trans).
10. Disconnect the EVAP purge pipe (2) at the chassis EVAP purge pipe (1).
11. Cap the chassis EVAP purge pipe.

Description:

12. Disconnect the fuel tanks to canister EVAP pipe (2) at the canister.
13. Disconnect the EVAP purge pipe (1) at the canister.

Description:

14. Remove the right rear wheelhouse liner panel.
15. Disconnect the fuel tank vent valve hose (1) at the fuel tank vent valve (3).

Description:

16. Remove the rear EVAP pipes (1) and the EVAP hose (5) from the following straps:
^ The straps attached to the fuel pipes (2).
^ The straps attached to the parking brake cable (3).
^ The strap attached to the rear wheelhouse liner brace (4).
17. Remove the rear EVAP pipes and the EVAP hose.

Description:

18. Remove the two rear upper fuel and EVAP pipe retainers.
19. Remove the fuel sender fuel feed pipe (4) (jet pump to left tank).
20. Remove the fuel feed rear crossover pipe (5) (left tank to jet pump).

INSTALLATION PROCEDURE

IMPORTANT: Mark or identify each fuel pipe in order to aid in installing the pipes in their original positions.

1. Install the fuel feed rear crossover pipe (5) (left tank to jet pump).
2. Install the fuel sender fuel feed pipe (4) (let pump to left tank).
3. Install the two rear upper fuel and EVAP pipe retainers. Tighten the fuel and EVAP pipe retainer nuts to 3 Nm (27 lb. in.).
4. Route the fuel tanks to canister EVAP pipe (2) through the right tunnel reinforcement opening.
5. Route the EVAP purge pipe through the right tunnel reinforcement opening.
6. Connect the fuel tanks to canister EVAP pipe (2) to the canister.
7. Connect the EVAP purge pipe (1) to the canister.
8. Remove the cap from the chassis EVAP purge pipe.
9. Connect the EVAP purge pipe (2) to the chassis EVAP purge pipe (1).
10. Connect the fuel tank vent valve hose (1) to the fuel tank vent valve (3).
11. Connect the fuel tank vent valve hose (5) to the rear wheelhouse liner brace (4) with 1 strap.
12. Connect the fuel tank vent valve pipe (1) to the fuel pipes (2) with 2 straps.
13. Connect the fuel tank vent valve pipe to the parking brake cable (3) with 2 straps.
14. Remove the cap from the chassis fuel return pipe.
15. Install and connect the fuel return rear pipe (2).
16. Install and connect the fuel feed rear crossover pipe (9) (left tank to jet pump).
17. Remove the cap from the fuel filter inlet.
18. Install and connect the fuel feed pipe (8) at the fuel filter.
19. Install and connect the fuel sender fuel feed pipe (3) (jet pump to left tank).
20. Install the right fuel tank. Refer to Fuel Tank Replacement (Right w/Auto Trans) or Fuel Tank Replacement (Right w/Manual Trans).
21. Install the left fuel tank. Refer to Fuel Tank Replacement (Left w/Auto Trans) or Fuel Tank Replacement (Left w/Manual Trans).
22. Tighten the fuel filler cap.
23. Connect the negative battery cable.
24. Inspect for leaks.
24.1. Turn the ignition switch ON for 2 seconds.
24.2. Turn the ignition switch OFF for 10 seconds.
24.3. Turn the ignition switch ON.
24.4. Check for fuel leaks.