I run this set up on my car with E85, it has a stainless screen in the gold colored prefilter and a paper element in the blue filter between the pump and the regulator. After reading about the possible effects on the paper element I will order a 40 micron stanless filter for it and replace it instead of waiting for the paper element to fail, I have used this set up for two years now 12AN to the pump, 10 AN to the regulator, #8AN return to the tank. BG400 pump, Magnafuel 2 port regulator.