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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Today's Featured Article - Harvestin Hay: The Early Years (Part 2) - by Pat Browning. The summer of 1950 was the start of a new era in farming for our family. I was thirteen, and Kathy (my oldest sister) was seven. At this age, I believed tractor farming was the only way, hot stuff -- and given a chance I probably would have used the tractor, Dad's first, a 1936 Model "A" John Deere, to go bring in the cows! And I think Dad was ready for some automation too. And so it was that we acquired a good, used J. I. Case, wire tie hay baler. In addition to a person to drive th
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