# 1999 ford mustang coup gas gauge stuck on full

**URL:** <https://community.cartalk.com/t/1999-ford-mustang-coup-gas-gauge-stuck-on-full/67774>\
**Category:** Maintenance/Repairs\
**Tags:** mustang, ford\
**Created:** [September 9, 2011, 11:26pm UTC](https://community.cartalk.com/t/1999-ford-mustang-coup-gas-gauge-stuck-on-full/67774 "2011-09-09T23:26:06Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![paulgray](https://avatars.discourse-cdn.com/v4/letter/p/ecae2f/32.png) [@paulgray](https://community.cartalk.com/u/paulgray)\
**Post date:** [September 9, 2011, 11:26pm UTC](https://community.cartalk.com/t/1999-ford-mustang-coup-gas-gauge-stuck-on-full/67774/1 "2011-09-09T23:26:06Z")

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1999 ford mustang coup gas gauge stuck on full. Just bought the car, it was a known condition been this way 2 years. any ideas?

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**Author:** ![mleich](https://avatars.discourse-cdn.com/v4/letter/m/71c47a/32.png) [@mleich](https://community.cartalk.com/u/mleich)\
**Post date:** [September 9, 2011, 11:29pm UTC](https://community.cartalk.com/t/1999-ford-mustang-coup-gas-gauge-stuck-on-full/67774/2 "2011-09-09T23:29:01Z")

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Ah, if only the gas TANK were always full. Wouldn’t that be great?

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**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\
**Post date:** [September 10, 2011, 4:03am UTC](https://community.cartalk.com/t/1999-ford-mustang-coup-gas-gauge-stuck-on-full/67774/3 "2011-09-10T04:03:09Z")

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When the gas tank is almost empty, take a rubber mallet and bang on the bottom of the gas tank. If the gauge reads lower the float in the gas tank is hanging up.

Tester

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**Author:** ![Paul\_S1](https://avatars.discourse-cdn.com/v4/letter/p/858c86/32.png) [@Paul\_S1](https://community.cartalk.com/u/Paul_S1)\
**Post date:** [September 10, 2011, 6:30pm UTC](https://community.cartalk.com/t/1999-ford-mustang-coup-gas-gauge-stuck-on-full/67774/4 "2011-09-10T18:30:25Z")

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I had this problem on a 1998 Ford Windstar. The fuel sending unit wasn’t working. It wasn’t the float being hung-up, it was a faulty wiring harness, which was replaced with a used one from a parts yard, which did the trick.

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**Author:** ![FordMan59](https://avatars.discourse-cdn.com/v4/letter/f/eb8c5e/32.png) [@FordMan59](https://community.cartalk.com/u/FordMan59)\
**Post date:** [September 11, 2011, 8:16pm UTC](https://community.cartalk.com/t/1999-ford-mustang-coup-gas-gauge-stuck-on-full/67774/5 "2011-09-11T20:16:49Z")

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Sounds like you either have a short in the wiring system or the float in the tank is hung on something holding it in the full position all the time.