The Fuel Lever Sensor is an important input to the Control Module for the enhanced evaporative system diagnostic. The fuel level information is needed for the Control Module to know the volume of the fuel tank. The fuel level affects the rate of charge in the air pressure in the Evaporative Emissions System (EVAP). Several of the Enhanced Evaporative System diagnostic sub-tests are dependent upon the correct fuel level information. The diagnostic will not run when the tank is greater than 85% or less than 15% full. (This sensor signal will disable the misfire when the fuel levels are less than 15 %).