Jerryj39,

Sorry to hear about your problems; I've had a bunch with my GMS 47, but I think I might have most of them licked.

Since it's running so well at other times, other than the tank/carb level issue, I would take your tank, and REPLACE every bit of tubing,
and try a sintered clunk. I won't bore you with all the problems I had with mine but the fix for many of them was to do just what I suggested. Even though it LOOKS good, replace the tubing, and try the sintered clunk. A difference in GMS full-throttle loops and half-throttle loops should be nil, unless there is a pressure, foaming, or clunk problem, and all are corrected easily.

I had mine out today on a Debonair with a 12x4 APC and it did fairly well until the throttle arm retaining hex nut came loose and I lost throttle control and had to use the "Terra firma kill switch". Replaced the broken APC with a wooden Zinger 12x8 (just because I had one!) and what a dog that flight was. Replaced that with a wooden MAS 11x6 and had a totally enjoyable flight with gobs of power and fun.

Let us know what you come up with!

Blue skies,

DL