Lines, Fuel: Description: Description
WARNING: This page is about a different car, the 2012 RAM Pickup and 2012 RAM Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
BEFORE REMOVAL: Due to the special service requirements required for these tubes, lines or fittings, also see WARNINGS and SAFETY PRECAUTIONS.
Due to the high-pressure requirements of the CNG system, special stainless steel, SAE straight thread, single-ferrule, compression-type fuel tube fittings are used. These will connect all fuel tubes and components on the high-pressure side of the system (inlet side of the fuel pressure regulator).
WARNING:
Due to the extreme high pressures of the CNG fuel system, certain precautions must be taken when handling or servicing fuel tubes or fuel tube fittings:
- Where applicable, use only single-ferrule compression type fittings on the CNG system. If a fitting must be replaced, use only an original equipment replacement part.
- When handling fuel tubes, do not allow ends of tubes to get scratched. Small scratches are a potential source of a leak.
- Always check and remove any burrs from the end of tubes before installing fittings.
- After some types of high-pressure fittings are tightened, a go no-go gauge inspection tool must be used. This is to be sure they are properly drawn up (tightened).
- Do not attempt to remove or tighten a fitting with the fuel system under pressure.
- Surface finish of the fuel tube is very important for proper sealing. Fuel tubes that are oval shaped, have any depressions, heavy scratches or raised portions should not be used.
- Never attempt to force a fuel tube into a fitting or ferrule. The fuel tube should fit easily into fittings/ferrules if they are not damaged.
- The fuel tubes on the CNG system are under extreme high-pressure. Never use steel, copper, brass or any other material as a substitute for the original seamless stainless steel fuel tubes.
- When removing/installing a fitting, always use a backup wrench on the fitting body to prevent any fuel tube twist.