The info that I have gathered from others running E-85 is that the paper filters are doomed since the E-85 likes to draw in moisture. That moisture, over time, gets into the paper filters and "bloats" them so that the fuel flow is now lower through the filter. It sounds reasonable, but it was hit or miss for these guys. I just broke down and bought a stainless mesh filter, so that I wouldn't have to worry about the paper possibly being an issue.