The fuel vapor recovery system is used to reduce hydrocarbon emissions from the fuel system into the atmosphere, which is achieved through the presence of activated carbon in the EVAP filter.
While the engine is not running or while the tank is being filled with fuel, fuel vapors from the sealed fuel tank pass into the EVAR filter where they are retained.
When the engine is running, the EVAP canister is purged with air that is sucked through the purge tube into the upper part of the intake manifold. The EVAP canister purge solenoid valve is controlled by the ECM. When the engine is running, the vapor flow is regulated by the EVAP canister purge solenoid valve in proportion to the increase in air flow.
The EVAP canister purge solenoid valve also serves to shut off the purge of vapors when decelerating.
