I used a standard fuel tank with a check valve in the pickup tube on my hired man and it runs just fine. I used a 3/32 hardened ball to indent the seat and then replaced the ball with a SS 3/32 ball for running. The top of the fuel tank is about an inch below the needle valve in the carb. Also don't forget the vent hole in the tank. I put mine in the cap. Oh, by the way, nice engine. Dave