Fuel-System

I consider the use of a flop-tube system in the main tank (located in the fuselage behind the firewall).

Another solution may be a header tank also called feeder tank. This provision is made for inverted flight. Gravity filled during normal attitude portion of flight, a little amout of fuel is located in the feeder tank and is used during the inverted part. Sure a fuel pump will be needed.

Next is a fuel injection system (throttle body injection). This special carburetor has no float system. The fuel amount needed is conditioned by the air amount metered at the intake. This is not like an electronic injection system - it's a simpler version and not really an injection, it is more like a depression system with only a few moving parts. We know the systems of Aerovee, Revmaster, Ellison and  Rotec.