On Board Refueling Vapor Recovery System: Notes

When refueling vehicle, fuel tank pressure increases. When pressure reaches the setting value of the Refueling Control Valve (RCV) opening pressure, RCV opens. Allowing air and vapor pressure in fuel tank to pass through EVAP vapor cut valve into the EVAP canister. Where fuel vapors are absorbed by EVAP canister activated charcoal and air is purged to atmosphere. When during refueling process fuel tank becomes full, refueling EVAP vapor cut valve is closed and refueling is stopped by auto shut-off. Vapors stored while fueling are purged when vehicle is driven. RCV is closed during driving and EVAP system operates same as in conventional systems.