Alero L4-144 2.4L DOHC VIN T SFI (2000)
Fuel Tank Pressure Sensor: Description and Operation
Fuel Tank Pressure Sensor - 2
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 3-wire electrical harness connects the sensor 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.
