High Pressure Regulator (HPR) to Low Pressure Lock-Off (LPL)

Bi-Fuel/Alternative Fuels



TOOLS REQUIRED
J 41416 Ultrasonic Leak Detector

REMOVAL PROCEDURE




1. Relieve the CNG fuel system pressure. Refer to Fuel Pressure Relief Procedure.

CAUTION: Refer to Battery Disconnect Caution in Service Precautions.

2. Disconnect the negative battery cable.
3. Remove the battery.
4. Remove the air cleaner assembly.
5. Disconnect the fuel line at the LPL line union (1).
6. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle.




7. Disconnect the fuel line at the HPR.
8. Remove the exhaust heat shield attachment.




9. Remove the fuel pipe mounting bolts from the body clips.




10. Remove the fuel pipes from the body clips.
11. Remove the CNG fuel line from the vehicle.

INSTALLATION PROCEDURE




1. Install the CNG fuel line under the body of the vehicle.
2. Install the fuel pipes into the body clips.

NOTE: Refer to Fastener Notice in Service Precautions.




3. Install the fuel pipe mounting bolts into the body clips and the vehicle body.

Tighten
Tighten the body clip mounting bolts to 6 N.m (53 lb in).




4. Connect the fuel line to the HPR using a new O-ring face seal. Lubricate the O-ring with petroleum jelly or the equivalent.

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

5. Install the exhaust heat shield attachment.

Tighten
^ Tighten the 2 exhaust shield nuts to 2 N.m (18 lb in).
^ Tighten the exhaust shield bolt to 1 N.m (9 lb in).




6. Connect the fuel line to the LPL line union (1) using a new O-ring face seal. Lubricate the ORFS with petroleum jelly or the equivalent.

Tighten
Tighten the fuel line fitting at the LPL line union to 24 N.m (18 lb ft).

7. Install the air cleaner assembly.
8. Install the battery.
9. Start the engine. Inspect for CNG fuel leaks at each serviced fitting using the J 4141&