The fuel hose sold now, including marine, is safe for E85.
Don't take this the wrong way but you are guessing too much with your issues. I.E. Pump and what is cause "white stuff". You can't say "it's the pump" without testing.
Let gas drain into a clear jar a little bit before paint filtering, so you can see what is at the bottom of tank.
Very glad you caught it, good work.
