Quote:
Originally Posted by MJM
As I recall from various threads,etc last Summer, gas with Ethanol is also a no-no for boats with fiberglass fuel tanks. Something about the Ethanol congealing, or something like that. We were VERY relieved to open the flooring of our boat to find a stainless tank... 
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Hi MJM,
You are correct. There is a deterioration of older fiberglass gas tanks due to ethanol.
. The other problem is that ethanol is hygroscopic (likes water) and will absorb water. That is why it is recommended that the tank be topped for storage.
Hope this helps.
Jetskier
http://www.boatus.com/Seaworthy/fueltest.asp