This BWD/Pollack FSV2A
6-port fuel valve should finally solve all the fuel flow problems. It requires rewiring the dash switch to route the gauge senders to the new valve for switching, because the valve's motor requires both poles of the dash switch. But that's an easy mod, and the reliability of this valve makes it worth all the effort.
The FSV3 contains NOTHING but the valve & instructions - no connector or switch. FSV3A is the connector alone. The smaller metal valve is FSV1.
O'Reilly Universal Fuel Tank Valves
See the NEXT several pics...