Fuel Level Sensor

Fuel level sensor is an important input to the PCM for enhanced EVAP system diagnostic. PCM needs fuel level information to know volume of fuel in fuel tank. Fuel level affects rate of change of air pressure in EVAP system. Several enhanced EVAP system diagnostic sub-tests are dependent upon correct fuel level information. Fuel level diagnostic will not run when the tank is less than 15 percent or more than 85 percent full. Diagnose any Fuel Level Sensor DTCs first, as they can cause other DTCs to set.