Oh! I also wanted to say that I checked for leaks this evening. I clamped off one end of the fuel line (between the carb and the neadel valve) and blue into the other end. It seems as there were not any leaks.
I guess my next move is to remove the tank and inspect it to see if I can add the fill line as a third connection.

Thanks for everyones help and if anybody has more ideas please pass them one.
I'll try and report on my progress soon