The Vapor Canister of the Acura TL captures and stores fuel vapors so they don't vent to the air, helping the sedan meet clean-air standards. Inside the canister, activated charcoal captures fuel vapor, and then engine vacuum opens the purge valve to pull the mix into the intake for clean combustion. The loop enhances the quality of the air and also saves some fuel. The Vapor Canister beside the tank was just a simple charcoal canister that trapped vapors until purge in early TL versions. Subsequent iterations of the Acura TL incorporated a vent solenoid, pressure sensor, and a self-test capability in OBD II, allowing the upgraded Vapor Canister to confirm the integrity of the sealed system. These devices detect leaking caps or tiny leaks before the damage is done to the environment. Even with enhancements, the charcoal volume and purge action remain the same, and the driving feel is unchanged. Each Acura TL uses this Vapor Canister to balance tank pressure, hold back vapors at rest, and return them during engine operation. An Acura Vapor Canister that is sealed properly will last for years, needing only filter renewals on certain units.
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