ORIGINAL: mumblety-peg
I have a 45 I'm trying to run inverted in a Zen. With the engine inverted, the carb is well below the fuel tank. I can't change that.
I think the engine is flooding because the fuel is siphoning out the tank. If I start the engine with the plane inverted, will it run OK in the air?
Thanks
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If I understand what you are saying properly, your YS is not functioning as it should. No fuel should flow until the engine places a demand (vacuum) upon the regulator circuitry (that thing below/above the carb that most folks call a pump - it isn't). The fact that it can flood proves that it is not working properly. Running this engine inverted is a piece of cake, when all is right. It cannot siphon fuel when the regulator circuitry is working properly.
Usually, a diaphragm replacement and diddling around with the valve and spring will restore things to normal operating order. Don't give up. This engine will do what you want it to do - in spades.