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The fuel is too old, it has started to separate. I believe that gasoline loses about 1 point of octane for every month of life, so if you filled the boat last year with premium 93 octane, it is down in the low 80s now which makes the motor run rough, or not at all.
I would drain every drop you can get out of the tank and fuel lines and slip a gallon into your mower or older car every now and then to get rid of it.
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