EVAP System Small Leak Detected Fresh Air Side

Common symptoms

What you'll notice

• Check and tighten the gas cap to ensure it is properly sealed
• Inspect and replace any damaged or cracked hoses in the EVAP system
• Inspect and repair any loose or disconnected EVAP system components
• Clean or replace the EVAP canister purge valve
• Perform a smoke test to identify any leaks in the EVAP system and repair accordingly

Common causes

Most likely first

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

How to diagnose & fix

Work through it in order

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