Fuel Tank Selection Valves
 

Starting to think about new fuel system plumbing for the boat.

Going to go with 3 tanks. What tank slection valves are available?

how would you set it up so that the drain and return run through a valve system?

I currently have three tanks. I had to rig a looped system without a fuel return to the tank. It took a lot of tinkering to make it trouble free.
One option that would work would be to plumb engine with return line to the main tank and use transfer pumps from the aux. tanks to the main triggered by a manual timer.
I have a friend that uses this system in his diesel sport fish.