# Crazy Gas Gauge

**URL:** <https://community.cartalk.com/t/crazy-gas-gauge/9860>\
**Category:** Maintenance/Repairs\
**Created:** [January 26, 2008, 5:02pm UTC](https://community.cartalk.com/t/crazy-gas-gauge/9860 "2008-01-26T17:02:31Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Chevy2000](https://avatars.discourse-cdn.com/v4/letter/c/a8b319/32.png) [@Chevy2000](https://community.cartalk.com/u/Chevy2000)\
**Post date:** [January 26, 2008, 5:02pm UTC](https://community.cartalk.com/t/crazy-gas-gauge/9860/1 "2008-01-26T17:02:31Z")

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I have 2000 Chevy Silverado 1/2 ton single cab pick-up with over 100,000 miles(v6 auto trans.). Recently the gas gauge goes nuts when the tank gets below half. I recently had the fuel filter changed but still no relief. Any thoughts as to what might be causing this?

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**Author:** ![edb1961](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/edb1961/32/122_2.png) [@edb1961](https://community.cartalk.com/u/edb1961)\
**Post date:** [January 26, 2008, 5:27pm UTC](https://community.cartalk.com/t/crazy-gas-gauge/9860/2 "2008-01-26T17:27:25Z")

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It’s probably the sending unit which is part of the fuel pump assembly. My 2000 Blazer’s fuel gauge has been doing the same for a year now. You might want to try a bottle or two of Chevron Techron to clean the the sending unit, but it didn’t help my truck. Unless you want to change the fuel pump ($$$), I suggest filling up the gas tank each time and tracking the mileage between fill ups.

Ed B.

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**Author:** ![mcparadise](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mcparadise/32/32_2.png) [@mcparadise](https://community.cartalk.com/u/mcparadise)\
**Post date:** [January 26, 2008, 5:44pm UTC](https://community.cartalk.com/t/crazy-gas-gauge/9860/3 "2008-01-26T17:44:34Z")

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Sounds like a bad fuel sender to me. This part is INSIDE the fuel tank and probably costly to replace, but you could ask a mechanic for an estimate. Or you could ignore it.

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**Author:** ![Cougar](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/cougar/32/21348_2.png) [@Cougar](https://community.cartalk.com/u/Cougar)\
**Post date:** [January 27, 2008, 7:23am UTC](https://community.cartalk.com/t/crazy-gas-gauge/9860/4 "2008-01-27T07:23:14Z")

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I agree about the sending unit and also trying the Techron for a couple fill ups. It may help solve a bad connection problem. If not, then the more expensive new replacement is needed.