I have a GMS 120. Its about done with its break in process on the test stand with all most a gallon through it, and runs like a top. But when I hold the test stand up more than about 30 degrees it will stay running at mid to high power then when I throttle down it will starve for fuel and die. When I plug the muffler and carb and blow into the fuel line there is a nice air leak around the carb retainer bolt and nut, its bad enough that when I go to throttle cut off the engine almost doesn’t want to stop because its sucking enough air threw the leaks to keep running. Would this cause it to starve for fuel at high AOA (angle of attack)? I have researched gms and they ar notorious for carb leaks and cutting out at high AOA in flight. I have read of Perry pumps for this problem or sealing the air leaks.
My Question is what’s the best material and method for sealing carbs. Iv heard red rtv. What’s the best thing to clean the aluminum before applying sealant? I would rather try this method first than using a pump. Would simply sealing vacuum leaks help draw more fuel or should I just invest in a pump for reassurance? Thank you…….. Tony