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I frequently use fuel stabilizer in my lawn tractors when storing them over winter, and have found it actually fairly effective. I have also remarked that I am able to store gas much longer and have it usable in string trimmers, lawn mowers, etc. if I have stored it with a fuel stabilizer in it.

However, I fail to see how fuel stabilizer actually works. I understand that it prevents moisture content increases, and prevents the evaporation of the volatile components of gas? Is this the case, and if so, how does that actually work?

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  • Im sure those are trade secrets covered by patents.
    – Moab
    Commented Jun 18, 2017 at 4:41

1 Answer 1

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The fuel stabilizer actually separates from the gasoline after you let it sit for a while and forms a film on top separating the air from the gas, preventing the gas from oxidizing and picking up moisture from the air.

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  • Huh, fascinating, and welcome to mechanics.stackexchange.com! Do you have any references you could link to?
    – anonymous2
    Commented Jul 21, 2017 at 9:40
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    toro.com/fuelfacts
    – Joe
    Commented Jul 21, 2017 at 13:27

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