Return to one tank only?
Although it would require some fuel management care, one could have the return line plumbed to one tank only. A simple furel selector valve suffices. Some of my old Bonanazas had this system, where the auxes would all return to the left main. One flies of the tank with the return first, making room for the fuel. Switching to the second tank fills the first one. Not that big a deal once one gets used to it.
Rafael
RV-8A flying
RV-12 just about ready (undergoing PAP )
Will have to sell one of them to build the -14. Decisions, decisions...