Ok I put a 1/2 tank in the plane and ran it on the ground then at wot put it nose up and down and on its side ect.. and once it ran for a while it did die on me with the nose down and the clunk not getting any feul. I did notice that the engine mount screws on the left side were loose and the engine was loose to vibrate. I tighted those and then put a new prop ( the other was an old one with some knicks in it) I'm going to have to take it back up to see what it will do now.