Hi!
Why I ask is because if you mount your engine in a correct way you don't need a pump. A pump always means trouble!
I haven't seen a plane that could not have the tank mounted correctly= tight against the firewall. Al it takes is a bit of modification to the fuselage...or use Tettra "Bubbless tank...or that you sweat solder your own tank.
Here is the 110cc tank I made from 0.3mm tin plate for my Marutaka DC-3.
Second picture is the 150cc Tettra tank in my Q-500 Viper.