Originally Posted by Thunda Down Under
I had thought of fitting an electric fuel pump on the axillary tank (with in line valve) and just keep topping up the main tank in use.
This would allow the axillary tank to be drained then operate as normal.
It is an option. Van's makes a 4 position fuel selector so I opted to feed direct to the engine thus eliminating the need for an additional pump. It also allows me to start feeding from the aux not long after takeoff and being to shift the CG forward again.
Definitely several ways to go about it. Good luck!