Tools Required

J 41416 Ultrasonic Leak Detector

Caution: Natural gas is highly flammable. In order to reduce the risk of fire and personal injury, keep sparks, flames, and smoking materials away from the vehicle while you perform the Compressed Natural Gas (CNG) fuel system service.

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 the Fuel Pressure Relief .
2. Remove the low pressure regulator. Refer to Compressed Natural Gas Low Pressure Regulator Replacement .



3. Remove the LPL mounting bolts (4,5).
4. Remove the LPL bracket (3).



5. Unscrew the LPL outlet elbow fitting (3) and the LPL (2) as an assembly from the LPR (1).
6. Remove the LPL outlet elbow fitting (3).
7. Remove the LPL inlet fitting (5).

Important: Apply thread sealer containing Teflon® to the LPL inlet and outlet fittings. Do not use Teflon® tape.





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.

1. Install the LPL inlet fitting (5).

Tighten
Tighten the fitting finger-tight plus one to three turns.

2. Install the LPL outlet elbow fitting (3).

Tighten
Tighten the fitting finger-tight plus one to three turns.




3. Install the bracket (3) and mounting bolts (4,5).

Tighten
Tighten the bolts to 12 N·m (106 lb in).

4. Install the low pressure regulator. Refer to Compressed Natural Gas Low Pressure Regulator Replacement .
5. Start the engine and use the J 41416 in order to inspect for leaks at each serviced fitting.