ES300 — NEW FEATURES 14 6. Fuel System ORVR System The ORVR (On-Board Refilling Vapor Recovery) is a system that uses a charcoal canister, which is pro- vided onboard, to recover the fuel vapor that is generated during refueling. This reduces the discharge of fuel vapor into the atmosphere. Intake Air Chamber Fuel Tank Over Fill Check Valve VSV (for EVAP) EVAP Service Port VSV (for Vapor Pressure Sensor) Vapor ECM Fuel Inlet Pipe Fuel Charcoal Canister Vapor Pressure Sensor Fuel Pump 159EG08 1) Operation When the fuel tank cap is removed, atmosphere applies to the fuel tank over fill check valve’s cham- ber A .
Refueling causes the internal pressure of the fuel tank to increase, the vapor flows to the charcoal canister while maintaining valve B pressed, thus allowing the vapor to become absorbed by the char- coal canister. When the tank is full, valve C closes, thus shutting off the passage to the charcoal canister. Valve B Chamber A From Fuel Inlet Pipe (Atmosphere) To Charcoal Canister Vapor Valve C Fuel Tank Over Fill Check Valve 159EG09