Compressed Natural Gas Fuel Line Venting
WARNING: This page is about a different car, the 2002 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.
WARNING:
Fuel supply lines remain pressurized after engine shutdown. Ensure no open flame of any type is present. Flammable gases may be present and ignite, resulting in possible injury. Always release (vent) fuel pressure before disconnecting any fuel injection-related component downstream of fuel tank shutoff solenoids. DO NOT vent fuel system indoors. Manufacturer recommends venting fuel through a vent stack that allows natural gas to be vented outside of repair shop. Vent stack must be approved by local authorities.
Raise and support vehicle on hoist. Remove the fuel tank shield. Close fuel tank valve. Residual fuel line pressure will be present. Set ALT/GAS switch to ALT position. Start and run vehicle until ALT/GAS switch indicator goes off. To pressurize system, slowly open fuel tank valve and reverse procedure.