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An ORVR system has the added benefit of being able to retain those emissions, by delivering them to the vehicle's activated carbon-filled canister. It later then disposes of the vapors by adding them to the engine's inlet manifold during normal operation—and thus to the fuel/air mixture supplying the engine.
Fuel vapor storage canister for a Peugeot 205. Evaporative emissions are the result of gasoline vapors escaping from the vehicle's fuel system. Since 1971, all U.S. vehicles have had fully sealed fuel systems that do not vent directly to the atmosphere; mandates for systems of this type appeared contemporaneously in other jurisdictions.