Stoppage occurs following fuel shut-off, or by having the fuel level in the tank rise high enough to close the control valve. This control valveĬontains a float that rises to seal the large diameter vent path to the EVAP canister. It took 10 minutes of very slow filling to get it full. Tank through the control valve and on to the vapor canister. Vapor is absorbed in the EVAP canister until vapor flow in the lines stops. This It took 1 gallon normally, but then acted as if the tank was full. Is vented to the EVAP canister to capture escaping vapors. With air flowing into the filler tube, there are no fuel vapors escaping to theĪtmosphere. Once the refueling vapors are captured by the EVAP canister, the vehicle's computer controlled purge system draws vapor out of theĬanister for the engine to burn. The vapor flow is metered by the purge solenoid so that there is no, or minimal impact on driveability or tailpipeĪs fuel starts to flow through the fuel fill tube, it opens the normally closed check valve and enters the fuel tank. Vapor or air is expelled from the 1" I.D.) creates an aspiration effect drawing air into the fuel fill tube. During refueling, the fuel tank Refueled. Certain ORVR components can be found in.įuel flowing into the fuel filler tube (approx. The ORVR (On-Board Refueling Vapor Recovery) system is used to remove excess fuel tank vapors. This is done while the vehicle is being The ORVR (On-Board Refueling Vapor Recovery) system consists of a unique fuel tank, flow management valve, fluid control valve, one-wayĬheck valve and vapor canister. Certain ORVR components can be found in. Refueling Vapor Recovery System: Description and Operation
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