Before any EPA mandate was put into action, California devised its own regulations, ahead of every other state, by 16 years, when it required the implementation of the Stage II vapor recovery system. They implemented regulations which would limit the amount of fuel vapor released into the atmosphere during the refueling of a motor vehicle. Īccording to Freda Fung and Bob Maxwell, the Environmental Protection Agency (EPA) has been controlling emissions among the United States since the 1970s. ![]() Kline hold the patents for the ORVR system. is to eventually make the Stage II systems obsolete. The goal behind implementing the ORVR system throughout the U.S. However, an ORVR system is able to retain those emissions, delivering them to the vehicle's activated carbon-filled canister and then to dispose of those vapors by adding them to the engine's inlet manifold and the stream of fuel supplying the engine, during normal operation. Without either of these two systems, fuel vapors trapped inside gas tanks would be released into the atmosphere, each time refueling of the vehicle occurred. There are two types of vehicle emission control systems: the ORVR, and the Stage II vapor recovery system. ![]() An onboard refueling vapor recovery system (ORVR) is a vehicle fuel vapor emission control system that captures volatile organic compounds (VOC, potentially harmful vapors) during refueling.
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