Fuel Pressure Sensor: Description and Operation

NOTE: The descriptions and specifications contained were in effect at the time this information 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.

Fuel Absolute Pressure Sensor
The Fuel Absolute Pressure (FAP) sensor is integral to the Compuvalve. It is a pressure transducer that converts pressure to voltage through a piezo-resistive element. This signal is monitored to make sure that the pressure regulator is functioning properly and is used to adjust the injector combination according to supply pressure. The FAP sensor allows the vehicle to start in ALT fuel mode at a minimum of 95 psia (CNG) or minimum 25 psia (LPG). It also controls when the vehicle will auto switch, 45 psia (CNG) or 25 psia (LPG).