2002 Ford F150 Bi-fuel Supplement 1st Printing - Page 14

Instrumentation and controls When the selector switch is placed in the GAS position, your engine will operate in the unleaded gasoline mode. ALT GAS If the CNG or LPG (depending upon application) runs low during the operation of the vehicle in the gaseous fuel mode, the gaseous fuel injection system will automatically change to the unleaded gasoline operating mode. The green indicator light on the fuel selector switch will turn off to show the vehicle has changed to the unleaded gasoline operating mode. The vehicle's fuel system will NOT automatically change to the gaseous fuel mode (CNG or LPG, depending upon application), if the level of the unleaded gasoline runs low. FUEL GAUGE The fuel gauge in your CNG or LPG Bi-fuel vehicle (depending upon application) behaves similarly to a standard gasoline fuel gauge. The fuel gauge will provide a linear reading from Full down to Empty. • Fuel gauge operation for a LPG Bi-fuel vehicle is based on a float type sensor measuring the level of the liquid propane in the fuel tank(s). • Fuel gauge operation for a CNG Bi-fuel vehicle is based on the pressure and temperature of the natural gas in the fuel tank(s). Depending upon the application, a full fuel gauge reading will occur at a pressure of approximately 20 700 kPa (3 000 psi) or 24 800 kPa (3 600 psi) at a temperature of approximately 21°C (70°F). For more information on fuel gauge performance during the fast-fill method of CNG fueling, refer to Refueling your Bi-fuel vehicle in the Maintenance and care chapter of this supplement. 14