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.
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