Fuel Level

The scan tool displays 5.00 to 0 Volts. The PCM supplies a 5 volt signal circuit to the fuel level sensor. The float inside the fuel tank is connected to a variable resistor which causes the signal voltage to change with fuel level. The PCM converts the signal voltage to a fuel level value. The scan tool displays close to 0.8 volts for an empty tank, and close to 2.5 volts for a full tank.