Your fuel may not be draining back, it may just be evaporating, at least I think that's what mine does. Several posts about this if you do a search. I am running an in-tank FI Pump so not a big issue for me, as I can refill the carb before cranking the engine, but the pump definately runs some to fill the carb back up when I first turn it on after setting for a day or more.
I think some electric pumps are designed to let fuel be drawn through them w/o much restriction, but I'm not sure which pumps. I think I have heard that some of the Carter Electric Pumps are designed to allow draw through, but not sure it's true.
Tom V. has posted about a system that he has used. It involves 2 Ts (or Ys, Ys preferred for better flow), a check valve and electric pump. Split the line that comes out of the tank with a T/Y, and put a check valve in the one line and the electric pump in the other line, then rejoin the lines with the other T/Y. The check valve keeps fuel from the electic pump from just running in a loop and lets the mechanical pump pull through the check valve W/O the restriction that many electric pumps would impose.
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