I'm working on my Hot Bodies A-7, and while breaking the engine in, I noticed that if the nose of the plane drops, the engine goes lean and about dies. Doesn't matter how rich I have the needle. A siphon is created once fuel flow starts since the tank is so high. My guess is that once the nose drops, the siphon affect goes away, and there isn't enough pressure from the pipe to continue to supply fuel. Has anyone encountered this problem before? I'm contemplating adding a fuel pump to maintain positive fuel flow. Input appreciated.