Where is the center of the tank with respect to the carburetor? While it may have been too rich before, your fuel feed may be a problem. Your engine should not die because it has consumed 2/3 of the fuel in the tank. I would try the pinch test with a full tank and one that is 1/3 empty. The response should be the same. The engine should speed up when the line is pinched.
Originally posted by plowboy
My Hangar 9 alpha trainer started stalling today after burning about 1/3 tank of fuel. I leaned it out one half turn and it hasn't stalled after that. However, I noticed that the exhuast had a sooty gray color for the first time. Am I overheating the engine, and if so, what are the symptoms of an engine running too hot? Thankyou very much in advance for any help.