This has always been a problem with my Super Tigre GS 40 in my TopFlight Contender. Engine at take off is sloppy rich and stays this way until maybe 5-7 minutes of flying. The engine then starts leaning itself out. I'll then have to land as sometimes it goes so lean it dies. I do indeed think the tank centerline is ever so slightly lower than the needle valve. Would this be causing this problem? I don't have the room to raise the tank, so is there anything else I can do to solve the problem? Would a regulator and check valve on the pressure line help? Just to make sure I wasn't running out of fuel, I connected the pump and sucked several onces of fuel out, so this problem is showing up way before it's out of fuel. Engine is fresh with a new ring and bearings from sitting and rusting. I was trying to break it in rich, but the thing keeps leaning on me midflight.

Mike