The engine is an OS 32. The trouble is I can't seem to keep it running. I replaced the fuel lines and the glow plug. I followed the manual on how to set the needle valve and the mixture screw. I've leaned it out and richened it up. Here is what it is doing.

I can get it started with out too much of a problem. When I open the throttle, it runs for anywhere from 1 to 5 minutes, and dies. Bring it back to the starter table and try again. It seems that the fuel is not getting into the carb, and I can't figure out what is causing this.

I apply the starter motor to try to start it. You can see the fuel in the line that leads to the carb. As the starter motor turns, you can see the fuel in the line advance to the carb, then it goes back to the tank. Open up the needle valve one turn and try again. Same thing. I had the valve open 6 turns and it did no good. The fuel would advance and go back to the tank. Can anyone tell me what causes this and what I can do to fix it?

This bird is grounded until I get this one figured out.....