Gasoline smell outside the car or visible fuel leak

Symptoms

• Strong gasoline smell when standing near or under the parked car
• Wet spot, staining, or actual dripping fuel visible underneath
• Smell may be present even with the engine off
• Possible fuel gauge reading dropping faster than expected

Likely causes

• CommonLeaking fuel tankCorrosion, a puncture from road debris, or a failed seam can cause the tank itself to leak, usually visible as staining or dripping underneath toward the rear of the car.
• CommonLeaking fuel lineLines running along the underside of the car from the tank to the engine can corrode, crack, or get damaged by road debris.
• PossibleLeaking fuel filler neck or hoseThe hose connecting the gas cap area to the tank can crack or loosen over time.
• PossibleFailed fuel pump seal at the tankWhere the fuel pump assembly seals into the top of the tank, a worn gasket can leak, sometimes visible from inside the trunk or under the rear seat depending on the design.

What to do

1. Do not start or run the engine near an active fuel leak or strong fumes; move away from the vehicle and call for a tow rather than driving it.
2. Note the exact location of any staining or dripping (front, middle, rear, driver or passenger side) to help a mechanic find it faster.
3. Avoid any source of ignition (smoking, open flame) near the vehicle and the leak area.
4. Ventilate the area if the car is in a garage, since fuel vapors can build up and are dangerous in enclosed spaces.
5. Have the vehicle towed to a repair shop for proper diagnosis and repair rather than attempting to drive it with an active fuel leak.

Tools and parts

When to call a pro

See a mechanic immediately (via tow if the leak is active) for a visible fuel leak; this should not be driven on or delayed.

Safety