Fuel Tank Pressure Sensor: Description and Operation

The Fuel Tank Pressure sensor is a sensor much like the MAP sensor. The Fuel Tank Pressure sensor measures the difference between the outside air pressure and the air pressure (or vacuum) in the fuel tank.

The Fuel Tank Pressure sensor mounts to the fuel tank sending unit. A three wire electrical harness connects the sensor to the PCM. The PCM supplies a 5.0 Volt reference voltage and a ground to the sensor. The sensor will return a voltage between 0.1 and 4.9 Volts on the signal circuit.