Alternative Fuel Selector Switch: Description and Operation

BI-FUEL SYSTEM ALT/GAS SWITCH, ALT/GAS SWITCH LIGHT

NOTE: The descriptions and specifications contained here were in effect at the time it was approved for printing. Ford Motor Company reserves the right to discontinue models at any time, or change specifications or design without notice and without incurring obligation.






The ALT/GAS switch sends a signal to the Compuvalve requesting ALT fuel mode, when placed in the ALT position. If no signal is received by the Compuvalve, the system defaults to base gasoline mode. The ALT/GAS switch light is incorporated into the ALT/GAS switch. It is controlled by the Compuvalve and is illuminated when operating in ALT/FUEL mode. If an emission critical Diagnostic Trouble Code (DTC) is recorded, the ALT/GAS switch light will change from a steady on to an irregular flashing condition. If a communication fault arises the indicator will flash with a steady pulse. Once the key is switched to ON, the switch will not change the fuel operating mode.






The dual tank configuration used on F-Super Duty 350 (if equipped) utilizes a three-position switch for selecting each of the fuel tanks individually (Petrol, LPG tank one or LPG tank two) and is designed with two separate ALT lights indicating which LPG tank is in use when illuminated. System operation with the three-position switch is identical to the two-position switch.