Artwork has a good point. I actually hadn't considered the return fuel. The idea of trying this out with half tanks should both answer the question and reduce the chances for a fuel spill.
The modified fuel system sounds like a great idea and I'd love to have a fuel polishing system but that's a swamp I'll have to drain after I get the alligators down to around my ankles!
Back to work - I just installed an new AC unit and my recirc pump quit.
I hope it's the relay - the pump is new!