I have tried both 2 and 3 line systems. I finally settled on a 2-line system because it is very simple. Put a T in the line (I use brass T's that I get at Wal-Mart in the aquarium section) between the fuel tank and the carb. Run the line to a fuel dot for filling/emptying. The carb on the BME44 won't get flooded when you fill, so crank away without worries.

Ken