The other problem would be that the fuel pressure needs to change as the RPMs change, so the pump would have to be pretty flexible. I was thinking about a renewable pressure source, such as a CO2 cannister or something that you could bleed pressure from and use as your "fuel pump". Not sure that would be real practicle though, but maybe. . . . .

So you're saying that a tank with more surface area on the bottom will exhibit less of the lean tank problem? Like a long narrow tank, that 's maybe not as tall?