I have:
Tank, RACOR 690T, fuel cooler, lp / RASP, inline 8um filter, VP44.
NO OEM ff because of heat buildup.
My theory is to get the fuel water free and particle clean (10um) before it goes anywhere. Run the lp / RASP to pressurize it. Filter it (8um) one last time for particles (if anything sluffed off in the lp pressurization system) before it goes to the VP44.
Bob Weis