[bigeasy1]

Another vote for Aluminum.
It isn't the aluminum that ethanol is causing problems with.It's the build up of crud that was in the tanks when ethanol became prevalent.
The Ethanol, being a stronger solvent than Gasoline,dislodged the years of accumulated build up in the fuel tanks,most which happened to be made of aluminum.
All that crud ended up in your filter,or worse,your carburetor.

If you went new,it wouldn't matter if you went with aluminum or polyethylene.Neither material is supposedly affected by ethanol,although if one turns out to be,I'd bet my last dollar that it will be the poly.