I don't know what material yours is made out of but ethanol is bad on everything including poly tanks which yours may be also (mine is) but I dont have the same boat but my newer cuddy (1990) is made of poly. It hasn't bothered mine yet that I can tell. A product called Store and Start (gas treatment) does leave a yellow coating on everything and seems to protect the items it comes in contact with and ethonol doesn't wash it off. It's sold at Wal-mart and marina's.
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Tis better to be quiet and thought a fool than open your mouth and prove it!!
1991 V-20 cuddy I/O 350 volvo duo prop, 1998 15ft Grumman 9.9 Johnson 
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