I did the same for my set up. It might have to do with the Aeromotive FPR when it is hot. However, I noticed this problem with the SARD FPR I was using too.sully said:i run my dual walboros on the stock fuel ecu.. I ran new wire inside the tank to the stock connector and ran new wire outside the tank using the stock connecters (depinning). I grounded my pumps on the pump hanger and used the old +/- at +/+ for the 2 new pumps.
I have been monitor my fuel pressure the last couple of days and I noticed that the pressure does not drop as much if the tank is full or more than 1/3 full. I guess I just have to keep more fuel in the tank from now on.