When I switched to e85 last year,my truck had 61,xxx miles. The only thing factory left over was the fuel tank itself ( i have a fuel system). I went through (3-4) 10 micron filters within the first 500 miles just to be on the safe side. The first filter was changed out after about half a tank and it was black. 2nd filter was like a dark shade of gray. The rest were okay but I changed them out anyway.
I plan on running last years filter for the first 1000 or so miles this year,when my engine gets installed. After that I will swap out the fuel filter again prior to going back to e85.
Have you tried getting your e85 from somewhere else? Maybe its the source you are getting it from?
2.3 whipple,built motor,jj fuel system,a1 trans
Pb so far 11.06 @ 124 with a 1.55 60'.