Fuel Hose/Pipe Replacement - Tee to High Pressure Regulator Passenger/Cargo

Tools Required

J 45878 Combustible Gas 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 Fuel Pressure Relief .
2. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection in Engine Electrical in the G/H Van service manual.
3. Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information in the G/H Van service manual.



4. Disconnect the CNG fuel line (4) from the high pressure regulator (HPR).



5. Mark the location and remove the fuel line P-clamp mounting bolts (1, 2, 5, 6) and clamps.



6. Disconnect the fuel line fitting (4) at the check valve tee (1).
7. Remove the fuel line from the vehicle.

Notice: Refer to Fastener Notice in the Preface section.




1. Install the fuel line and P-clamps (1, 2, 5, 6) into the vehicle.

Tighten

•	Tighten the U-nut mounting bolts to 10 N·m (89 lb in).

•	Tighten the self-tapping mounting bolts to 7 N·m (62 lb in).




2. Connect the CNG fuel line fitting (4) to the check valve tee.

Tighten
Tighten the fuel line fitting to 45 N·m (33 lb ft).




3. Connect the CNG fuel line fitting (4) to the HPR (3).

Tighten
Tighten the fuel line fitting to 45 N·m (33 lb ft).

4. Install the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection in Engine Electrical in the G/H Van service manual.
5. Start the vehicle and inspect for CNG fuel leaks at the serviced fittings with the J 45878 or an equivalent leak detector.

Fuel Hose/Pipe Replacement - Tee to High Pressure Regulator Cutaway

Tools Required

J 45878 Combustible Gas 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 Fuel Pressure Relief .
2. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection in Engine Electrical in the G/H Van service manual.
3. Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information in the G/H Van service manual.



4. Disconnect the CNG fuel line (4) from the high pressure regulator (HPR).



5. Mark the location and remove the fuel line P-clamp mounting bolts (1, 2, 3, 4) and clamps.



6. Disconnect the fuel line fitting (4) at the check valve tee (1).
7. Remove the fuel line from the vehicle.

Notice: Refer to Fastener Notice in the Preface section.




1. Install the fuel line and P-clamps (1, 2, 3, 4) into the vehicle.

Tighten
Tighten the mounting bolts to 10 N·m (89 lb in).




2. Connect the CNG fuel line fitting (4) to the check valve tee.

Tighten
Tighten the fuel line fitting to 45 N·m (33 lb ft).




3. Connect the CNG fuel line fitting (4) to the HPR (2).

Tighten
Tighten the fuel line fitting to 45 N·m (33 lb ft).

4. Install the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection in Engine Electrical in the G/H Van service manual.
5. Start the vehicle and inspect for CNG fuel leaks at the serviced fittings with the J 45878 or an equivalent leak detector.