Mopar 5281258AA CANISTER-Vapor

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To check for excessive fuel vapor pressure in the fuel tank, remove the gas cap and listen for the sound of pressure release.

The EVAP system prevents fuel system vapors from escaping into the atmosphere. On warm days, vapors trapped inside the fuel tank expand until the pressure reaches a certain threshold, at which point the fuel vapors are routed from the fuel tank through the fuel vapor vent valve and the fuel vapor control valve to the EVAP canister, where they're stored temporarily. When the conditions are right, the Powertrain Control Module (PCM) opens the canister purge solenoid, allowing the fuel vapors to be drawn from the canister into the intake manifold, where they mix with the air/fuel mixture before being consumed in the combustion chambers.