Gday i just bought a new fuel tank for my rc and i am wondering how is it going to work without a primer and the fuel line up the top...Does anyone know how the work?
Depends on the tank, but yeah, there should be two lines to the tank. One is for positive pressure for the exhaust pipe, the other goes to the carb inlet.
Even without the pressure, the carb has a venturi effect once it's running. As the air passes the inlet inside the carb, it sucks fuel into it. The pressure line from the pipe just helps things along.
Regardless, I use associated primer bulbs if I can. I know some say they are prone to having issues, but really, I've been using them for years on all my nitro's and they work really well for priming. They also give me an extra minute of roof time to get to my truck when I crash.