John:

The common "Gas" fuel hose is Tygon, and while it will work with the alcohol fuels, it gets hard in a hurry. Best to use the silicone hose. You don't really have much choice for the clunk line inside the tank, when it gets hard the clunk can't clunk anymore. The tank stopper I'm not sure about - it seems to me it disintegrates using alcohol.

A real life example. When Archer Daniels Midland and the other eco-Nazis pushed hard and got alcohol blended gasoline fairly common, I was working for the importer of an up-scale European car. We started having problems with our fuel injection hoses, the alcohol was causing them to disintegrate from the inside. And the bits of hose were clogging control regulators, filling nozzle filters, and generally causing mayhem. We replaced several thousand sets of hoses (wasn't just one year model that was affected) and a few hundred complete fuel systems. All because some uneducated asses decided to yell about gasohol, and ADM wanted to increase profits. Didn't matter that gasohol is more expensive as well as being less efficient. Sounds good for the eco-freaks.

Anyway, play it safe. Replace everything. It's a lot better to do it now than later, while you're repairing the damage from the dead stick landing.

Bill.