It depends on how old the fuel line is that you have on the boat. If it was from the pre-ethanol days, you will want to replace it, I had lots of trouble with gummed up carbs when the fuel was switched. The ethanol would break down those lines, and bulbs, and cause particulates, and other rubber compounds to make it to the carb bowl. If those built up, you would have an issue.

I put a new fuel line on about 7 years ago, put a little seafoam in the fuel, and have never had another issue, all I run is Shell 89.