help with fuel tank

[DennisJ]

I am trying to put a second tank in the bed, to be used as the primary tank with an air dog suppling fuel to the motor from the in bed tank. I want to wire the air dog to factory harness and put a toggle switch on the existing factory fuel pump to transfer fuel to the tank in the bed, should be about 100 gallons total. My question is do i need a check valve in the line from factory pump to the tank in the bed? If so where do i get one that will hold up to ulsd???



thanks much for any help Oo.