Ebay GT45 + 5.9 Magnum + E85 blow thru

Thanks again for all of the input guys.
I hooked up my analog fuel pressure gauge and went for a spin. Same issue. Dropping pressure. It's not the gauge.

To myduster360s point, I do have one of those crappy (bottom of the pic) filters after the regulator. I took apart both my prepump and post regulator filter and cleaned them. I guess an easy test would be to remove the little filter element from the post pump filter and test....and hope the injectors don't get clogged.