How to Tell if Gas is Mixed

ArizonaKevin
Edited Date/Time 9/19/2021 8:40pm
Found a 5 gallon jug of gas behind some things in my garage and I can't remember if I had mixed it or not. It is AvGas so no ethanol to go bad, I think I filled the AvGas around November of last year.
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183Matt
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183Matt 9/17/2021 3:38pm
9/17/2021 3:38pm
Pour it out and start over. Not worth the risk unless you know for sure. Just my 2 cents.
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murph783
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murph783 9/17/2021 3:53pm
9/17/2021 3:53pm
I mean color I guess? AVGAS is blue, so if you’re running say red oil and it’s purple, bingo bango you got mix. I wouldn’t chance it though
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FGR01
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FGR01 9/17/2021 4:22pm
9/17/2021 4:22pm
AvGas 100LL is pure bright blue colored. Any bottle made of PET plastic can hold gas (gatorade bottle, water bottle, etc). Pour a little in a PET bottle so you can see the color easily.

The definitive test for mixed or not is the cardboard test. Pour a small amount of the fuel in question on a clean piece of cardboard and allow it to evaporate fully, about 1-2 minutes. Straight gas will leave no trace while mixed gas will leave an oil stain.

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mwssquad827
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mwssquad827 9/19/2021 8:40pm
9/19/2021 8:40pm
FGR01 wrote:
AvGas 100LL is pure bright blue colored. Any bottle made of PET plastic can hold gas (gatorade bottle, water bottle, etc). Pour a little in a...
AvGas 100LL is pure bright blue colored. Any bottle made of PET plastic can hold gas (gatorade bottle, water bottle, etc). Pour a little in a PET bottle so you can see the color easily.

The definitive test for mixed or not is the cardboard test. Pour a small amount of the fuel in question on a clean piece of cardboard and allow it to evaporate fully, about 1-2 minutes. Straight gas will leave no trace while mixed gas will leave an oil stain.

Damn!! That’s an opinion and a example of a and b!?!?!
Sir you can’t do that kinda stuff on vital sir!

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Falcon
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Falcon 9/21/2021 8:53am
9/21/2021 8:53am Edited Date/Time 9/21/2021 8:53am
Run it in your 2-stroke and see if the engine blows up. If it seizes, that was straight gas. LaughingLaughingTongue
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face biter
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face biter 9/22/2021 8:26am
9/22/2021 8:26am
The only true way to tell is to take a long, deep breath of it through your nose… I mean really get it all up in your sinuses, hold that breath for about 15 seconds then exhale slowly. Then take a quick sip of it, gargle and spit, then one more sip and swallow it, pre mixed goes down smooth and non mixed tastes like gasoline.
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