Fuel Pressure Relieving - Between The Engine and The Manual Shut-off Valve

Fuel Pressure Relieving - Between the engine and the manual shut-off valve

Between the engine and the manual shut-off valve

WARNING
Compressed natural gas is flammable and highly explosive. You could be killed or seriously injured if leaking natural gas is ignited.
Stop the engine, and keep heat, sparks, and flames away.

This procedure should be done outside in a well-ventilated area or in a properly equipped CNG shop.

This procedure will allow you to safely work on any part of the fuel system downstream of the manual shut-off valve, such as fuel pressure regulator P1 or the fuel injectors.

1. Raise the vehicle on a lift.

2. Close the manual shut-off valve (A).

3. Start the engine, and let it idle. After a few minutes, the engine will stall.

4. Turn the ignition switch to LOCK (0).