Refueling Vapor Control Valve Circuit/Open

Common symptoms

What you'll notice

• Check the fuel cap: Ensure that the fuel cap is tightly closed and properly sealed to prevent any vapor leakage.
• Inspect the EVAP system: Thoroughly examine the evaporative emission control system for any potential leaks or damage.
• Replace the fuel filler neck: If the fuel filler neck is damaged or worn out, it might be causing the circuit/open issue and needs to be replaced.
• Check wiring and connectors: Inspect the wiring and connectors related to the refueling vapor control valve circuit to identify any loose connections or damaged wires.
• Replace the refueling vapor control valve: If all other possibilities have been ruled out, it might be necessary to replace the refueling vapor control valve itself to resolve the circuit/open problem.

Common causes

Most likely first

1. Faulty refueling vapor control valve
2. Loose or damaged wiring or connectors in the refueling vapor control circuit
3. Malfunctioning fuel tank pressure sensor
4. Blocked or clogged charcoal canister
5. Faulty evaporative emission (EVAP) system purge valve

How to diagnose & fix

Work through it in order

1. Check engine light comes on
2. Decreased fuel efficiency
3. Rough idle or stalling
4. Difficulty starting the vehicle
5. Fuel odor inside or outside the vehicle