[mr0077]

Snake Farmer, your supply line comes out of the top of the fuel cell, but the pickup end of it must be at/near the bottom of the cell, right? If so, then if you mount the pumps low, at the same elevation as the bottom of the fuel cell, they should stay primed until the fuel level drops below the pump inlets. A check valve might work if it has the flow rate you'll need. Could you have an in-tank pump to prime the primary pumps? Never heard of something like that, but...