although this affects mainly boats, I thought I'd cross post this here in case any of you have a fiberglass fuel tank.
There are great 'problems' showing up due to the 'changeover' of gasoline addives - MTBE to Ethanol: Fiberglass fuel tanks dissolving and leaking, harmful destructive deposits formed inside engines, etc. About half the USA states have already banned MTBE additive and are rapidly changing over to an ethanol additive, the ethanol is quite incompatible with most of the fiberglass resin used in fuel tanks. The decomposition products of the 'melting/dissolving' resin doesnt burn and will form vast and destructive deposits in the engine (similar to putting sugar into the gasoline).
for more info: