Thanks Paul, I appreciate the explanation, it helps a lot. The tech would not elaborate on the bypass fuel coming into the bladder and to what extent it helps maintain fuel capacity in the bladder vs the escaping fuel out the bottom holes along with the pump demand. That's my concern, you helped explain that.
What kind of regulator are you using to get the pressure down to the 3-4lbs Webers like? Also, where is your fuel bypass, off the regulator?
The'40 tanks, when low, are notorious for fuel surging forward and away from the fuel pickup at the rear (long narrow tanks). With efi demands, a sump of sorts is mandatory and not many options of where to place one. One of our esteemed members on this forum sent me a link to another product that would surely work, thanks Scott. It's also an internal sump and pump design but they do get pricey.
Tim