Symptoms of a Bad or Failing Gas Cap

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Cost of Replacing a Bad or Failing Gas Cap

Common signs include the cap not tightening properly, a fuel smell in the car, and the Check Engine Light coming on. Our certified technicians can come to you and diagnose the problem. You will receive a $30 credit towards any follow-up repairs that result from the diagnostic. Following are example prices for Gas Cap Replacement. Click on the button below to get an upfront quote for your car.

Cars Estimate Parts Cost Labor Cost Savings Average Dealer Price
2010 Dodge Nitro $83 $13.13 $70.00 31% $120.63
2004 Ford Freestar $88 $18.17 $70.00 29% $125.67
2005 Ford F-150 $88 $17.98 $70.00 29% $125.48
2012 BMW 328i $105 $35.08 $70.00 26% $142.58
2008 Audi TT Quattro $105 $35.08 $70.00 26% $142.58
2003 Jaguar X-Type $81 $11.49 $70.00 31% $118.99
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How to Diagnose a Bad or Failing Gas Cap?

gas cap

The gas cap, also known as the fuel filler cap, is a simple but important component that is found on the vast majority of road going cars and trucks. Their purpose is simple; to prevent dirt, debris, and dust from entering the gas tank, as well as providing a reliable seal. The cap also plays an important role in the operation of the vehicle’s evaporative emissions system, which is designed to capture and reuse fuel vapors from the gas tank that would otherwise be released into the atmosphere. Because the cap is frequently removed, every time fuel is added to the vehicle, it can wear out over time and will need to be replaced. Usually a bad or failing gas cap will produce a few symptoms that can alert the driver of a potential issue.

1. Cap does not tighten properly

One of the most common symptoms of an issue with the gas cap is a cap that does not tighten properly. Most gas caps are designed to click once they are tightened sufficiently. If the cap does not click, or clicks and then pops loose again then that may be a sign that it may need to be replaced.

2. Fuel smell from the vehicle

Another symptom of a possible issue with the fuel cap is a fuel smell from the vehicle. If the gas cap seal becomes damaged or worn it may cause fuel vapors from the gas tank to leak from the filler neck. This may result in a gasoline odor from the vehicle as a result of the escaping vapors.

3. Check Engine Light comes on

An illuminated Check Engine Light is another symptom of a potential issue with the vehicle’s gas cap. The gas cap is a part of the vehicle’s evaporative emissions system and can cause problems with the system if it has an issue. An improperly sealing fuel cap may cause an evap system leak, which will set off the Check Engine Light when the the computer detects the leak. The Check Engine Light can also be set off by a wide variety of other issue so having the computer scanned for trouble codes is highly recommended.

A bad or failing fuel cap will not necessarily cause major performance issues, but it can set off the Check Engine Light, which will prevent the vehicle from passing an emissions test. If you suspect that your gas cap may be having an issue, have the vehicle inspected by a professional technician, such as one from YourMechanic, to determine if the cap should be replaced.

Gas Cap
Check Engine Light

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Recent Gas Cap Replacement reviews

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YourMechanic Gas Cap Replacement Service

Average Rating

4.4/5

Number of Reviews

24

Rating Summary
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Joe

12 years of experience
205 reviews
Joe
12 years of experience
Once he arrived he stayed to give a thorough inspection and possible options for car (our need could have been other things as well). Had the right part. Definitely recommend Joe and recommend the service.
2004 AUDI S4 - GAS CAP - NASHVILLE, TENNESSEE

Anthony

13 years of experience
15 reviews
Anthony
13 years of experience
Anthony was very personable and he was very knowledge about the problem with my vehicle. Gave some great guidance as to what to do over the next few days if problem does not resolve itself.
2012 JEEP GRAND CHEROKEE - GAS CAP - EL PASO, TEXAS

Chris

8 years of experience
194 reviews
Chris
8 years of experience
Have an intermittent check engine light need some advice. With it off now I will get an emission check.
2007 DODGE GRAND CARAVAN - GAS CAP - FOUNTAIN HILLS, ARIZONA

Jay

34 years of experience
519 reviews
Jay
34 years of experience
For a while it seemed that Jay had hit a "snag" but stuck with the problem and fixed it! I admire his "stick to itness."
2005 MINI COOPER - GAS CAP - REDLANDS, CALIFORNIA

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