# Fuel system cleaner

**URL:** <https://community.cartalk.com/t/fuel-system-cleaner/131233>\
**Category:** Maintenance/Repairs\
**Created:** [December 22, 2018, 1:07am UTC](https://community.cartalk.com/t/fuel-system-cleaner/131233 "2018-12-22T01:07:46Z")\
**Posts on this page:** 7\
**Page:** 1

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**Author:** ![Bradley\_Street](https://avatars.discourse-cdn.com/v4/letter/b/ee59a6/32.png) [@Bradley\_Street](https://community.cartalk.com/u/Bradley_Street)\
**Post date:** [December 22, 2018, 1:07am UTC](https://community.cartalk.com/t/fuel-system-cleaner/131233/1 "2018-12-22T01:07:46Z")

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I have an 05 Chevy Malibu and I bought two of the gum out brand complete fuel system cleaners. It says on there to add on a nearly empty tank. However I rarely ever go anywhere, a full tank lasts me over a month. Can I add it to a 3/4 full gas tank without ruining anything?

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**Author:** ![texases](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/texases/32/862_2.png) [@texases](https://community.cartalk.com/u/texases)\
**Post date:** [December 22, 2018, 1:08am UTC](https://community.cartalk.com/t/fuel-system-cleaner/131233/2 "2018-12-22T01:08:29Z")

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Yes, no problem

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**Author:** ![NYBo](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/nybo/32/17281_2.png) [@NYBo](https://community.cartalk.com/u/NYBo)\
**Post date:** [December 22, 2018, 1:34am UTC](https://community.cartalk.com/t/fuel-system-cleaner/131233/3 "2018-12-22T01:34:21Z")

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It will simply be more diluted than the directions call for. No harm, but possibly less benefit. Speaking of benefit, what are you trying to accomplish?

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**Author:** ![Bradley\_Street](https://avatars.discourse-cdn.com/v4/letter/b/ee59a6/32.png) [@Bradley\_Street](https://community.cartalk.com/u/Bradley_Street)\
**Post date:** [December 22, 2018, 1:37am UTC](https://community.cartalk.com/t/fuel-system-cleaner/131233/4 "2018-12-22T01:37:02Z")

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Just regular maintenance to the car. Been a while since it had some. To be honest I saw it on sale for buy one get one so I just picked it up at the store lol. No particular reason.

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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:** [December 22, 2018, 1:51am UTC](https://community.cartalk.com/t/fuel-system-cleaner/131233/5 "2018-12-22T01:51:02Z")

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It doesn’t matter.

You can add the Gumout when the tank is nearly empty and then fill the gas tank. or fill the gas tank and then add the gumout.

The instructions: **Add entire bottle to nearly empty gasoline tank at time of oil change. Refill tank with 18 to 35 gallons of gasoline.**

Tester

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**Author:** ![VOLVO-V70](https://avatars.discourse-cdn.com/v4/letter/v/8e8cbc/32.png) [@VOLVO-V70](https://community.cartalk.com/u/VOLVO-V70)\
**Post date:** [December 22, 2018, 1:53am UTC](https://community.cartalk.com/t/fuel-system-cleaner/131233/6 "2018-12-22T01:53:08Z")

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Did you change the plugs on this as one of your other threads asked about?

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**Author:** ![Bradley\_Street](https://avatars.discourse-cdn.com/v4/letter/b/ee59a6/32.png) [@Bradley\_Street](https://community.cartalk.com/u/Bradley_Street)\
**Post date:** [December 22, 2018, 1:54am UTC](https://community.cartalk.com/t/fuel-system-cleaner/131233/7 "2018-12-22T01:54:12Z")

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Yep. Changed plugs and boots today also.