Just drawing plans for my F350 convertion and I plan on using a used NPR truck tank- sprayed with black bed liner. Davo 234 filter, Holly pump and regulator, Heat exhanger as close to the engine as I can, a custom billet fuel bowl cap with a billet fuel bowl filler (reduce valume, less purge time).
What I would like to know is if I use regulated fuel pumps on both diesel and wvo, can I use check valves to default the system? WVO on a little higher psi than diesel and a shut off valve that would circulate the WVO. Or, if the filter clogges...less psi and the diesel takes over without any lost of power or road side work!

How much psi should I use for the diesel and for the WVO?