ON-BOARD REFILLING VAPOR RECOVERY (ORVR) SYSTEM
ORVR system is used to recover fuel vapors into EVAP canister that are generated during refueling. ORVR system consists of fuel inlet pipe, refueling control valve and EVAP canister. (Scheme 1)
When fuel tank cap is removed, atmospheric pressure is applied to signal line on refueling control valve. When fuel flows into fuel inlet pipe and fuel tank, the pressure in fuel tank increases. Increased pressure in fuel tank causes vapor cut valve on control valve to open, allowing fuel vapors to flow into EVAP canister. When fuel tank is full, valve closes, shutting off vapor flow to EVAP canister.
