I'm pretty new to gas power and I'm trying to decide on a two line or three line fuel system for the Dave patrick Extra with BME 44 that I'm assembling.

Should I use a two line system with a vent to the top of the tank, and a filler or "T" in the line to the carb? Or should I use a three line system? If three lines, how should it be configured?

I have an old used gas powered airplane that I bought, and it uses a standard two line "glow" type system, with a fuel filler and muffler pressure feeding the vent to the gas(oiline) tank. I'm thinking that this isn't a good idea, but it did fly this way.

Many thanks.....