What is between the pump and the tank? A freind of mine recently upgraded his fuel system and had a similsr problem, the new pump would suck the fuel filters dry which ended up driving the fuel pressure down at the carbs. His old system was two Holley blues(one started leaking) with two Fram chrome canister fuel filters between the fuel cell and the pumps, out of the pumps into a Y (all # 8 lines between the Y and the fuel cell) and then a # 8 to the front with two little Holley fuel regulators, one for each carb. He replaced the pump with a BG 480 and athe little Holley regulators with a four port Aeromotive return style regulator with a #10 feed from the back and a # 10 return to the cell The only thing he left was the two Fram fuel filters fed by 2 # 8 lines into the Y and then into the BG 480 He now has two inline 40 Micron Aeromotive fuel fliters that are rated to flow a lot more than the two Frams that where rated at 90 GPH or less