The Ford Fusion Canister Purge Valve prevents fuel vapors from escaping the air by transferring them into the engine to burn them. In Ford Fusion vehicles, the Canister Purge Valve is located between the charcoal canister and the intake manifold. When engine vacuum is present, the valve opens so that stored hydrocarbons mix with incoming air, which reduces smog and helps improve fuel economy. Early Ford Fusion systems would simply vent the vapors through the valve while driving normally. The models later saw the introduction of on-board diagnostics. This allowed the engine control module to seal the canister vent and open the Canister Purge Valve with a tank pressure sensor confirming the vacuum hold. As a result of this update, detection of leaks became automated through the illumination of the check engine lamp after a failure of the Canister Purge Valve or a loose fuel cap not allowing a proper vacuum. Different versions utilize a canister that carries a serviceable filter. Other versions work with a sealed canister. Regardless, all Ford Fusions have the same electrically controlled Canister Purge Valve that does the job.
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