Onboard refueling vapor recovery

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Onboard refueling vapor recovery (ORVR) is a vehicle emission control system that captures fuel vapors from the vehicle gas tank during refueling. The gas tank and fill pipe are designed so that when refueling the vehicle, fuel vapors in the gas tank travel to an activated carbon packed canister, which absorbs the vapor. When the engine is in operation, it draws the gasoline vapors into the engine intake manifold to be used as fuel. In the United States, ORVR has been mandated on all passenger cars (since 2000) and light trucks (since 2006) by the United States Environmental Protection Agency. The use of onboard vapor recovery is intended to make vapor recovery at gas stations obsolete.