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Old 15 May 2017, 05:00   #1
Country: UK - England
Town: York
Boat name: Sugar Free
Make: Tornado
Length: 5m +
Engine: Yam 115
Join Date: Sep 2009
Posts: 119
Issue with leaving 2 stroke fuel for periods of time.

Just a question to see if anyone who leaves their fuel tanks full with 2 stoke (petrol and Oil) have found any issues when they are left for a month or so. Guess over winter is not a good idea. From a dive RIB perspective it is operationally better to leave the tanks full after use. Has anyone had any issues?

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Old 15 May 2017, 06:34   #2
Country: UK - Wales
Town: Cardiff
Length: no boat
Join Date: Aug 2014
Posts: 1,505
30 days should be ok but you can add fuel stabiliser if leaving longer particularly over winter etc it's supposed to work for up to 12 months once the fuel is treated so if topping with fresh unleaded add stabiliser and you know your ok for several months not sure if has any ill effect on pre mixed 2 stroke but says it is suitable for 2 & 4 stroke use.

Stihl, Honda etc recommend its use for their engines.

Read about it here:

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Old 16 May 2017, 09:31   #3
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Country: USA
Town: Western Colorado
Boat name: Vanilla Ice Cream
Make: Zodiac
Length: 4m +
Engine: 50 Johnson Outboard
Join Date: Apr 2016
Posts: 62
I use a fuel stabilizer like Star Tron for every gas up with ethanol in my 2 stroke. That takes care of the moisture problem in the fuel during use in the summer.
For winter I have sometimes (but not always) added another fuel treatment. No problems with the fuel being five months old and running in the spring.

I do try to fill up for the winter with non-ethanol gas in the fall as it doesn't go bad as quickly either as ethanol fuel. Standard non-ethanol fuel is more expensive and harder to find and not available at marina's where I live usually, hence only filling up with it at the end of the season.
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