Symptoms of a Bad or Failing Gas Cap

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Average rating from 33 customers who received a Gas Cap Replacement.

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.

2. 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.


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Recent Gas Cap Replacement reviews

Excellent Rating


YourMechanic Gas Cap Replacement Service

Average Rating

4.7/5

Number of Reviews

33

Rating Summary
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Peter

34 years of experience
346 reviews
Peter
34 years of experience
Chrysler 300 - Gas Cap - San Diego, California
Peter is always a pleasure he is professional and very thorough. He always recommends upcoming maintenance for my vehicles just so I can plan ahead for repairs and save some money. I love the convience of the mobile mechanic. Thank you Peter for solving the problem that the dealership could not. I will book again and I do recommend Peter.
Ford Focus - Gas Cap - La Mesa, California
Great experience!

James

28 years of experience
560 reviews
James
28 years of experience
Toyota Corolla - Gas Cap - Orlando, Florida
James is the best you can get! Not only does he fix everything he lets you know if you have any other issues and even shows you how you can fix it yourself. He's amazing and always has something interesting and fun to say. He knows how to hold a conversation and if you have a question he definitely has an answer. He's sweet and good hearted. His hard work doesn't go unnoticed. You will definitely love him! He's definitely my favorite of anyone I've ever had service my car!

Brian

21 years of experience
240 reviews
Brian
21 years of experience
Chrysler 200 - Gas Cap - Jacksonville, Florida
Brian listened to all the concerns I had with my car, he seemed very knowledgeable , and he also got the job done pretty quick.

Joe

13 years of experience
358 reviews
Joe
13 years of experience
Audi S4 - Gas Cap - Nashville, Tennessee
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.

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