Removed the in cab tank and put a 15 gallon tank under the bed. I have a Holley in tank fuel pump. Ran steel lines from the tank to the engine compartment and incorporated a 10 micron filter in the pressure line. The tank is vented with a roll over valve.

Added a Fuel Link to get the 73-10 ohm tank sender to work with the fuel gauge. That still needs some fine tuning.

As long as you don’t mind having the tank in the cab, it would be a lot cheaper and easier to use the in cab tank. You could use an external pump and utilize the tank drain for a return.
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Dan

35 CC Case
38 Chevy Pickup
51 3100 AD
58 3100 Apache Fleetside