John, on the older diaphrams, ie. 40's, 50's, and 60's, the rubber compounds were not designed for ethanol. Newer stuff, absolutely no problem. Older stuff turns to jelly. I'll make you a deal. I have 2 NOS F12/F14 fuel pumps on the shelf. I'll send one to you free of charge. Install it on your F-12 and put E85 in it. Tell me how that works out for you.
New stuff, fine. Pre 1990's, crap shoot. Look up solvents for butyl rubber, vs neoprene, vs silcone, etc. to be absolutely fair to your challenge, I should have qualified my statement for older, pre 1990 carb gaskets and fuel pump diaphrams.
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