The BMW 335i's Vapor Canister captures gasoline vapors to burn them instead of venting them, reducing pollution and fuel smell. This Vapor Canister is packed with activated charcoal that stores hydrocarbons from the sealed fuel tank until engine vacuum opens the purge path. As the air flows through the charcoal, the vapor takes the path to the intake manifold and is mixed with the normal air fuel mix. The early 335i cars applied a simple charcoal canister with a pressure relief cap. Later 335i models received an on-board diagnostics friendly Vapor Canister style that adds a vent solenoid and tank pressure sensor. With this, the engine computer of modern BMW engines can run leak tests and trigger a dashboard warning if the vacuum does not hold. Even with those electronic extras, every BMW Vapor Canister works the same way. Porous carbon adsorbs fuel vapor, while timed purge cycles help it clear out. The Vapor Canister can usually go for a long time without any sort of services aside from verifying that the hoses are clear and that cracks aren't causing a raw fuel smell. As long as it continues working, your BMW 335i won't have emissions problems.
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