What does a gas cap do?

Your gas cap acts as a barrier: it keeps contaminants out of your fuel tank while keeping the fuel itself and any vapors in.
This can reduce your car’s emissions, and a working gas cap is necessary to pass a state-mandated smog test.

How do I know if I need a gas cap replacement?

There are a couple of situations where your gas cap might need replacing:
  • It is missing
  • It is visibly broken
  • You’ve failed a smog or emissions test
  • Your check engine light is on
Your car’s computer system can detect if the gas cap is loose and causing any specific malfunctions. When this happens, your check engine light will illuminate, but you won’t know the particular error unless you have an OBD code reader.
Of course, it’s possible to drive with a broken gas cap and face few repercussions. However, it’s in your best interest to get a replacement as soon as you notice a problem—especially if you have to submit to annual emissions testing or if the gas cap has fallen off completely.

How to perform a gas cap replacement

Luckily, replacing a gas cap is a very simple maintenance service. All the mechanic needs to do is:
  • Examine the gas cap (if it’s still there), including performing a pressure test
  • Remove it if faulty
  • Install a new cap
  • Test the new one to make sure it performs
Depending on the caliber of your car, a new gas cap can cost anywhere from $100 to around $300.

Find affordable car insurance

Know what’s even easier than screwing on a new gas cap? Finding a better car insurance rate! But seriously—Jerry can find you a cheaper rate with just a few swipes and clicks, and you won’t have to compromise on your coverage level.
Because Jerry partners with over 50 top insurers—from Nationwide to Travelers, Dairyland, Chubb, and more—you’ll never have to worry about missing out on any of the best deals on the market.
Just choose the policy you like best out of the dozens of competitive quotes you receive, and Jerry will do all the heavy lifting, including registering you for your new policy and helping to cancel your old one. Why do all that work when Jerry can do it for you?
Jerry is a great service made easy for a newbie. It was my first time buying car insurance and everything was handled so quickly. Everything was done in the app, making the process incredibly satisfying.” —August M.
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