I want to add an aux tank & transfer fuel to main tank with a pump
during flight. I think it makes fuel management easier if the pump
transfer close to the engine's burn rate, say 14 gph.

I also want the pump to pick up fuel from the top of the aux tank via
a tube to the bottom of the tank so no hole below fuel level is
necessary. Does that mean I need a "self-priming" pump?

What kind of pump should I get?
Name & model no.?

Oh, it should run on 12V.

Many thanks,

Robin