EVAP System Large Leak Detected Fuel Tank Side

Common symptoms

What you'll notice

• Check the fuel cap for proper tightening or replace it if damaged.
• Inspect the fuel filler neck for cracks or leaks and repair or replace as necessary.
• Check and clean the EVAP canister vent valve, as it may be clogged or stuck open.
• Inspect the EVAP purge valve for proper functioning and replace if necessary.
• Inspect the fuel lines for any damage or leaks and repair or replace as needed.

Common causes

Most likely first

1. Loose or missing gas cap
2. Faulty EVAP canister purge valve
3. Cracked or damaged EVAP system hoses
4. Faulty EVAP vent valve
5. Malfunctioning fuel tank pressure sensor

How to diagnose & fix

Work through it in order

1. Check engine light illuminates on the dashboard
2. Decreased fuel efficiency
3. Difficulty starting the engine
4. Strong odor of fuel
5. Hissing sound coming from the fuel tank area