Q: Gas smell while driving.

asked by on

Every time I drive my car it smells like gas. I replaced five spark plugs and one of the spark plugs was covered in oil.

Smelling a gas odor coming from your vehicle is never good experience and it usually means there is a leak somewhere. From the description provided, it is quite possible that the EVAP Purge Canister has developed a leak and needs to be replaced on your vehicle. This canister captures gas fumes from entering the atmosphere and occasionally will need to replaced.

Other common situations I have seen concerning the vehicle and gas smells are when o-rings and seals, found on the fuel rail, go bad. They will develop a small but big enough leak to emit a gas odor, though your car may not actually be leaking gas. Another situation that comes to mind concerning the gas smell is when the back spark plugs were not torqued correctly after being replaced and then come loose, allowing once again a gas odor to escape the combustion chamber.

It was mentioned that five of your Expedition’s spark plugs were replaced and one was covered in oil. Spark plugs need to all be replaced at the same time in order for the engine to run efficiently and it is recommended this always be done. The spark plugs need to be torqued down to factory specifications as well so it is important that this is verified. In regards to the plug with oil on it, I would assume the vehicle may have developed a leak in the spark plug tube which allows oil to enter the orifice. With concerns like these, I would highly recommend enlisting the help of a certified mechanic as soon as possible to inspect your problems and avoid issues advancing in the future.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Gas smell while driving.

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: My engine belt is coming off slowly now it is halfway out. Does this mean i need to replace the belt or it is a faulty engine?

When the drive belt is walking itself off the drive pulleys, it can be due to tension or pulley damage. If the belt tensioner spring is weak or broken, the belt will be loose and can begin to come off...

Q: Something broke underneath my car.

Hello, without hearing the noise its hard to make a recommendation. If you hear a rattle sound it could be a loose bracket or loose bolt. If you are experiencing a clunking sound, you might have something loose in the...

Q: Knocking noise while braking

Hello. This noise could be coming from the lower ball joint, lower control arm, the strut, or the strut mount. It would be a good idea to have a certified technician, like one from YourMechanic, complete an inspection in order...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.