Airtex 5S13821 Fuel Tank Pressure Sensor

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The Fuel Tank Pressure Sensor or Fuel Vapor Pressure Sensor measures the atmospheric pressure inside the fuel tank and sends a voltage signal to the Engine Control Module (ECM). The Fuel Tank Pressure Sensor is part of the vehicle's sealed EVAP (Evaporative) system or emission control system which holds fuel vapors and prevents the release of raw hydrocarbons to the atmosphere. The EVAP system's other components such as the vent valve and purge valve function at the direction of the ECM based in part on the Fuel Tank Pressure Sensor's signal. A failed Fuel Tank Pressure Sensor can cause the Check Engine Light (CEL), Service Engine Soon (SES), Malfunction Indicator Lamp (MIL) or Gas Cap Open light to illuminate and can set a trouble code (P-code) in the ECM when not functioning correctly. Not correcting a failed Fuel Tank Pressure Sensor condition can cause reduced fuel mileage and performance, increased emissions and damage to other components such as the catalytic converter.