I am having a problem with my BME 50 running right. It runs fine on the ground, but when you take the plane and point it up or in a knife edge condition it wants to run lean and die. I've tried about everything possable and was wondering if anyone had suggestions. I sent it to BME and they sent it back and said it was fine. I have it mounted inverted on a profile plane. I have tried ajusting the needles and also replaced the fuel tank. Any suggestions would be appreciated.

Thanks,
Charlie