I have a problem with one of my planes that I think can be blamed on the fact that the tank sits lower than the engine. I have been told that the clunk should be level with carb. On mine the clunk sits about 3 inches below the carb. Maybe even more than that. The problem with it is that when ever I pull any tight manuver or a "hard G" the engine will die or starve out. Also I seem to have mixtures that are never the same. It seems to change tune, sometimes in mid-flight.If, in fact, I am right about this being my problem, will a pump fix the problem? I have a Perry VP-20 pump that I used on another plane with great results. I have changed engines from a Royal 46 with a perry carb to a MDS-48 with the stock carb. They both do the same thing but the MDS does it a whole lot worse. I think that comes from the difference between a two needle carb and a air bleed carb. Any advice would be appreciated. This is getting real irritateing but I think I am about to perfect the dead-stick landing!