fiberglass tanks break down from the ethanol fuel. The resin turns gummy and gets into the carbs. If it sits long, it will solidify and ruin the carbs. I had a 4 stroke Mercury(Yamaha) on a whaler gum up. It actually stuck the intake valves open. I was able to save the carbs and get the valves free, but it cost him some $$$. . luminum can be any coloracrbs for that motor were over $600 each(4 needed). If you have a fiberglass tank, get rid of it before it destroys your motor.
BTW, are you sure you have a fiberglass tank? they are usually red in color. Poly tanks(OK with ethanol) are off white or light brown
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