I have one of the older versions of this engine. I have finally found time to play with it but, it isn't working like it use to. Everytime I turn over the propellor trying to start it, it acts like it wants to run but it stops and backfires[:'(]. At first I noticed the pressure nipple was leaking so I put some glue on it to seal it, but it still isn't working[X(]. Also, is there suppose to be air or gasoline going through the pressure nipple? Sometimes I saw gasoline running throught the tube but now I just see air or nothing. Guys please help me because I really want to fly this airplane before it gets too cold.[&o]