Skylark L4-144 2.4L DOHC VIN T SFI (1997)
Fuel Tank Pressure Sensor: Description and Operation
Fuel Tank Pressure Sensor
Description
Notice: Numbers in text correspond to numbered components in image.
The Fuel Tank Pressure Sensor (1) is mounted on top of the modular fuel sender. The sensor measures the difference between the fuel vapor
pressure (or vacuum) in the fuel tank and the outside air pressure. A three wire electrical harness connects it to the PCM.
Operation
The PCM supplies a 5 volt reference signal and ground to the sensor. The sensor will return a voltage between 0.1 volts and 4.9 volts back to the
PCM depending on the fuel vapor pressure in the fuel tank. When the fuel pressure in the fuel tank is equal to the outside air pressure, such as
when the fuel cap is removed, the output voltage will be 1.3 volts to 1.7 volts.
