Fuel and storage- a very bad mix
I would say a month, tops. Today's fuel is full of stuff that will separate rather quickly, and I am as guilty as most with my twelve cars. Lazy, I guess, but I just know problems will arise and usually disconnect the fuel line at the carb and switch on the pump, or attach an electric at that end. Fuel is expensive, but old fuel is bad news. Drain it and start fresh. Speaking from lots of experience.
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