G'day Max I just went and tested the function of the primer and bulb, the smaller dia of the fuel lines picks up fuel and the larger dia fuel line to the primer returns fuel to the tank so primer is working as it should. The problem is that the smalle line goes to one side of the carby and on the other side of the carby is the fuel line from the tank. I am starting to think that there maybe a faulty check valve or something. I think I will admit defeat on this and go back to restoring my old motorbike at least I can figure them out OK.
