Cutlass V6-191 3.1L VIN M SFI (1998)
Fuel Tank Pressure Sensor: Description and Operation
DESCRIPTION
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 Powertrain Control Module (PCM). 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.
