Tools Required

J 45878 Combustible Gas Detector

Caution: The Compressed Natural Gas (CNG) system operates at pressures up to 24820 kpa (3600 psi). Relieve the CNG fuel system pressure before servicing CNG fuel system components in order to reduce the risk of fire and personal injury.

1. Relieve the CNG fuel system pressure. Refer to Fuel Pressure Relief .
2. Remove the battery, air cleaner outlet duct and the air cleaner assembly. Refer to Air Cleaner Assembly Replacement and Air Cleaner Outlet Resonator Replacement in the Engine Controls section of the J Platform Service Manual.



3. Disconnect the fuel line fitting (2) at the union located beneath the power brake assembly (1).



4. Disconnect the fuel line (1) at the LPL fuel inlet elbow (2).



5. Remove the fuel line (1,2) from the vehicle.

1. Install the fuel line (1,2) into the vehicle.



2. Install the fuel line (1) at the LPL fuel inlet elbow (2) using a new O-ring face seal. Lubricate the O-ring with petroleum jelly or the equivalent.

Tighten
Tighten the fuel line fitting to 24 N·m (18 lb ft).




3. Connect the fuel line fitting (2) at the union located beneath the power brake assembly (1) using a new O-ring face seal. Lubricate the O-ring with petroleum jelly or the equivalent.

Tighten
Tighten the fuel line fitting to 24 N·m (18 lb ft).

4. Install the battery, air cleaner outlet duct and the air cleaner assembly. Refer to Air Cleaner Assembly Replacement and Air Cleaner Outlet Resonator Replacement in the Engine Controls section of the J Platform Service Manual.
5. Start the engine. Inspect for CNG fuel leaks at each serviced fitting using the J 45878 .