I have a hpi 15fe engine. I thought that when you put your finger over the air hole in the pipe and pulled the pull starter it would moved fuel though the line and prime the eninge. Is this correct? If so it is not happening. What could cause this? I just installed new fuel lines and the tank seems to seal properly. I put a screw in the old primer hole because that looked like it was leaking with the button in there. Anyone know what could be wrong? Also if I cover the pipe and the carb it will prime, but it still will not start.