# Engine Light - Gas Cap issue with incompletely filling tank

**URL:** <https://community.cartalk.com/t/engine-light-gas-cap-issue-with-incompletely-filling-tank/29922>\
**Category:** Maintenance/Repairs\
**Created:** [May 2, 2009, 8:34pm UTC](https://community.cartalk.com/t/engine-light-gas-cap-issue-with-incompletely-filling-tank/29922 "2009-05-02T20:34:40Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![sscotti](https://avatars.discourse-cdn.com/v4/letter/s/ea5d25/32.png) [@sscotti](https://community.cartalk.com/u/sscotti)\
**Post date:** [May 2, 2009, 8:34pm UTC](https://community.cartalk.com/t/engine-light-gas-cap-issue-with-incompletely-filling-tank/29922/1 "2009-05-02T20:34:40Z")

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I have a 2003 Jeep Liberty Sport with 44,000 miles on it. My engine light has been going on and off (not blinking) for several thousand miles. I had it checked once and they said it was the gas cap and they reset it. It stayed off for a short while and then came back on. I recently filled up my tank completely for the first time in awhile and the engine light is now off. Was wondering if not filling up the tank (1/2 to 3/4) can cause the engine light to come on in regards to the gas cap. I’ll try filling the tank a couple of times and see if it stays off.

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**Author:** ![waterboy](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/waterboy/32/764_2.png) [@waterboy](https://community.cartalk.com/u/waterboy)\
**Post date:** [May 2, 2009, 8:42pm UTC](https://community.cartalk.com/t/engine-light-gas-cap-issue-with-incompletely-filling-tank/29922/2 "2009-05-02T20:42:47Z")

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Cleaning the cap and neck would be try one, just a paper towel will do, new gas cap might be inexpensive fix two to try, I do not know about this model but 1 Chrysler product we had used a pump every xx miles to pressurize and test the system, the pump failed, the dealer did a reset and the light was on the next day again. The new pump fixed the problem.