I have an os .46 on a Nexstar select and when I crank it, it fires right up, but it acts like its sucking air through the fuel lines out of the tank, (well you can see it coming through the lines) and it of course stutters and tries to die. I have replaced all the fuel lines and landed it dead stick twice since. It will run sometimes but the more juice you add, the more air you also get. any suggestions?