F150 (CNG Fuel Line Venting)
WARNING: This page is about a different car, the 2000 Ford Pickup, 2000 Ford Econoline, and 2000 Ford Contour. However, it is still accessible from the selected car via links, so may be relevant.
Raise and support vehicle on hoist. Remove fuel tank shield. Disconnect electrical connectors from fuel tank. Set ALT/GAS switch to ALT position. Start and run vehicle until ALT/GAS switch indicator goes off. To pressurize system, reverse procedure.