Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
On Board Refueling Vapor Recovery (ORVR) System
This vehicle is equipped with an On Board Refueling Vapor Recovery System (ORVR). This system has been developed and equipped to meet enhanced evaporative emission control requirements during vehicle moving, parking and refueling. The ORVR system operates in the following manner:
- One canister collects evaporative vapors while the vehicle is moving, parking and refueling.
- Collected vapor flows into the engine through the intake manifold, where it is consumed during vehicle operation.
- Fuel flowing through a reduced diameter section in the filler pipe creates suction in the filler neck.
The ORVR system operates by the Liquid Trap (Liquid Seal) system which ensures long-term durability. The ORVR system has been designed with the following functional features:
- Collection and routing of refueling vapors to the canister.
- Nozzles that are compatible with conventional and Stage II vapor recovery nozzles.
- Fuel shut-off signal.
- Prevention of liquid fuel entering the canister during normal driving and during vehicle rollover.
- Fuel tank over-pressure prevention.
- Fuel tank venting to canister during vehicle operation.
- Fuel vapor dome overfill protection.
This vehicle is also equipped with an On-Board Diagnostic II (OBD II) system. This system identifies failures or malfunctions of the ORVR system and warns the driver through the Malfunction Indicator Lamp (MIL) on the instrument cluster.
The ORVR system requires no special refueling procedures and maintenance.
The ORVR system and all fuel system components are designed to prevent electrostatic discharge using techniques recommended by SAE J1645. The test procedure (EDS-T-5525) is similar to the SAE J1113 test procedure.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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