A whiff of fuel now and then can be normal, but a persistent gas smell means fuel or vapour is escaping where it should not. Because fuel is flammable, it is worth tracking down quickly.
The most common minor cause
A loose or worn gas cap lets fuel vapour escape and is the number one cause of a fuel smell plus a check engine light. Tighten it until it clicks, and replace it if the seal looks worn.
Other causes to check
- An old fuel filler hose or a small leak at a fuel line fitting.
- Vapour from the charcoal canister or a fault in the evaporative emissions system.
- A recent overfill at the pump, which usually clears after a drive.
When to stop driving
If you smell strong fuel, see a wet patch or drips under the car, or the smell comes with poor running, stop and get it checked. A raw fuel leak near a hot engine is a fire risk.
Frequently asked questions
Can a gas smell be dangerous?
A faint smell from a loose cap is minor, but a strong smell or visible leak is a real fire hazard and should be addressed at once.
Why does my car smell of gas after starting cold?
A richer cold start can give a brief smell that clears as the engine warms. A lingering smell is not normal.
See our car accessory guides for tools that help you diagnose.
