But
I have had fuel sitting in my own mower for 6 months and causes no problems.
Seems to be conditions fuel is kept thats causing problems.
I have left fuel in my mowers for 5 to 6 months every year with no additives(Stabil, etc.) for 15 years now. All fuel here has ethanol in it.
I have seen bad fuel that was 2 weeks old from a conveinence store, possible inground fuel tank problem.
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