I got a I/O that sat for about 8 months. It's now clogging up the fuel filter screen at the carb every other time we go out. I replaced the filter/water seperator which did have some crap in it as well as a little water. Then I looked down in the tank and even sucked up some gas from the bottom which seemed to be clear. The stuff I'm pulling out of the screen at the carb looks like granulated varnish and after it evaporates it turns into a dust/sand like material. Is it possible the fuel is breaking down? I don't want to just replace the fuel without knowing what the real cause is because then what do I do with the 50+ gallons of old fuel? Any suggestions?