The Kia Sportage Vapor Pressure Sensor tracks the pressure inside the fuel tank to prevent gasoline vapors from escaping to the atmosphere and instead keeps them inside the EVAP system. Mounted near the tank, the Vapor Pressure Sensor transmits voltage signals to the engine computer that closes the vent solenoid and opens the purge valve so that a short vacuum check can reveal leaks. Failure to reach the target vacuum will store a trouble code and light the dash, which can often be fixed by simply tightening the fuel cap. The Vapor Pressure Sensor also ensures that the charcoal canister, hoses, and pressure-relief cap are properly sealed, thus preventing the tank from rupturing from excessive pressure or collapsing from excessive vacuum and ensuring that the vapors are burned in the engine. Early Sportage versions before full OBD II had a simple vented or pressure-relief cap, but the more recent Sportage versions had an electronic three-wire Kia Vapor Pressure Sensor with a five-volt reference, ground, and signal return for sharper diagnostics. Housings have gone from round flanges to square clip-on bodies, but all Kia Sportage Vapor Pressure Sensors operate the same way to measure very small pressure changes that can be displayed by a voltmeter in a matter of seconds. Keeping the Kia fuel cap tight and replacing a faulty Vapor Pressure Sensor when needed helps maintain the integrity of EVAP, increases mileage, and keeps smog-producing hydrocarbons from entering the city air.
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