Refueling Vapor Control Valve Stuck Performance/Stuck Open

Common symptoms

What you'll notice

• Check the fuel cap: Ensure the fuel cap is tightly sealed, as it could be causing the issue.
• Inspect the vapor control valve: Examine the valve for any signs of damage or blockage, and clean or replace it if necessary.
• Check the EVAP system hoses: Inspect the hoses connected to the vapor control valve for leaks or cracks, and repair or replace them if found.
• Check the EVAP canister: Inspect the canister for any damage or signs of contamination, and replace it if necessary.
• Inspect the charcoal canister purge valve: Examine the purge valve for any faults or blockages, and clean or replace it if needed.

Common causes

Most likely first

1. Defective or malfunctioning refueling vapor control valve
2. Clogged or blocked fuel vapor canister
3. Faulty or damaged fuel tank pressure sensor
4. Loose or damaged fuel cap
5. Issue with the evaporative emissions system hoses or lines

How to diagnose & fix

Work through it in order

1. Difficulty starting the engine after refueling
2. Poor fuel efficiency
3. Check Engine Light (CEL) illumination
4. Fuel odor
5. Engine misfire or hesitation