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.
Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.
Important: Do not hold the HPR using the HPR cover hex flange. As required, wedge a wrench between the HPR and the tank frame in order to keep the HPR from spinning in the bracket.
Use the following procedure if any HPR fittings require replacement:
Important: Prior to installation, apply pipe thread
sealant with Teflon® to the threads of the following:
• Fuel outlet fitting (4) • Pressure relief device (3) • Coolant fittings (2, 5)
Tighten
Tighten the fuel outlet fitting hand tight plus
one to three turns as required to seal and properly align the fitting.
Tighten
Tighten the pressure relief device hand tight plus
one to three turns as required to seal the fitting.
Tighten
Tighten the coolant fittings hand tight plus one
to three turns as required to seal and properly align the fitting.
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.
Important: Do not hold the HPR using the HPR cover hex flange. As required, wedge a wrench between the HPR and the tank frame in order to keep the HPR from spinning in the bracket.
Tighten
Tighten the nut to 54 N·m (40 lb ft).
Caution: Natural gas is stored under high pressure. If a leak occurs, the high pressure could cause a personal injury. In order to prevent Compressed Natural Gas (CNG) fuel leaks, always replace the CNG fuel system O-rings during service.
Tighten
Tighten the fuel line to 37 N·m (27 lb ft).
Important: Prior to installing the fuel inlet line fitting confirm that the fuel filter, spring and seal are properly seated in the HPR.
Tighten
Tighten the fuel line fitting to 48 N·m
(35 lb ft).
Tighten
Tighten the fuel line to 37 N·m (27 lb ft).
Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.