Symptoms
- Gasoline smell noticeable while driving or parked
- Smell stronger with windows up or the heater/AC on
- No visible puddle necessarily, since it may just be vapor
- Possible check engine light with an EVAP code
Likely causes
- CommonLoose or damaged gas capA cap that doesn't seal lets fuel vapor escape and can be drawn into the cabin.
- CommonSmall fuel line or fitting leakA cracked line or loose fitting near the engine can let vapor or liquid fuel escape.
- PossibleEVAP system leak (charcoal canister, hoses)A cracked EVAP hose or canister can leak fuel vapor that's normally captured and recycled.
- PossibleFuel injector or fuel rail leakA leaking injector seal can let raw fuel odor into the engine bay and cabin.
- Less commonCracked fuel tank or filler neckDamage from an impact or corrosion can create a slow leak near the rear of the car.
What to do
- Check that the gas cap is present, undamaged, and clicks fully closed.
- Look and smell around the engine bay and underneath near the fuel tank for wet spots or a strong fuel odor.
- Get the check engine light scanned for EVAP system codes if it's on.
- Avoid smoking or open flames near the car and don't ignore a strong, persistent gasoline smell.
- Have a shop pressure-test the EVAP system and inspect fuel lines and injectors if you can't find an obvious source.
- Fix the identified leak before continuing to drive regularly, since fuel vapor inside the cabin is a fire and health concern.
Tools and parts
- Flashlight
Gas capSearch: “gas cap for [year make model]”
EVAP hose or canisterSearch: “EVAP canister for [year make model]”
When to call a pro
See a shop soon if you can't find and fix an obvious cause like a loose gas cap, since a fuel leak is a fire risk.
Safety
Use caution
A strong or worsening gasoline smell can indicate a real leak; avoid open flames and smoking near the car and have it inspected promptly rather than continuing to drive it regularly.