Skip the auto shop - Our mechanics make house calls

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.

A: Smelling a gas odor coming from your vehicl...

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?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: How do I activate or deactivate the Auto Unlock feature?

You can configure both the Auto Lock and Auto Unlock features on your car separate from one another. You can also use a number of different methods to do it. Here’s what you need to know about activating or deactivating...

Q: Warning light not coming on

Hi there. Usually, this just means that the bulb has failed and just needs replacement. A certified technician would be able to get behind the instrument cluster and inspect the bulb to see if it has failed. It is recommended...

Q: We got gas, and car started making a skipping noise around 30 mph.

Hello, thanks for writing in. Most of the time when this occurs right after getting fuel it is because the fuel pump failed. It is very common for a fuel pump that has gotten hot from low fuel level to...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...