I'd do the DUAL fuel tanks with a crossover line (or two - One top and one bottom) like my boat fuel tanks are done. Be sure to add shut off valves! With crossover lines open - both tanks will seek their level so always having fuel in the one you'd be drawing from.
Barring that "fix" -- you could use a "Y" feed from both tanks - and a return "Y" to both tanks.... but I think I'd prefer a single feed and single return with the X over for simplicity.
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