FYI I measured the outlet port of the stock fuel hat the other day.
Inner diameter measured .185". (Less than 1/5th of an inch)
By contrast the 2007 GT500 hat we measured was .250" ID at the hat.
Volume = area x length
So we can calculate the added volume in % by using the area of each and dividing them by each other.
The math says .250" will flow 82% more than .185" ID.
IMO we are pushing a rediculous amount of fuel thru a .185" ID fuel fitting. 700 on E85 is enough fuel for 1000 on gasoline. I can't see how we would not have excessive pressure before this restriction in the hat when a BAP added.
I think the BAP + E85 = fuel pump failure is due to added head pressure of running more than 17.5v from the BAP's, which you would never need to do on gasoline.
What if we find a way to enlarge the opening, and run a larger line to the rails (if necessary)? This thread reminds me of the "fuel line upgrade" kits for the returnless 03/04 Cobras.