F150 Bi-Fuel (Gasoline & LPG)
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 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 indicator goes off. To pressurize system, slowly open fuel tank valve and reverse procedure.