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Hi Chasbo Take a recipient, open and remove the little "T" chaped drain valve at the bottom of the Zenith carburator, gas should flow continuously if not unscrew the pipe fitting at the carburator the gas should flow continuously if not check back all components to the fuel tank. If flows at the pipe fitting and not by the carb drain valve may be the pointer needle orifice is blocked with dirt or the float does not operate properly. My Zenith carburator float chamber was deformed by standing water freezing in the float chamber or was hitted by something or by the previous owner. If you want to see if the float operates correctly when the carburator is disassembled put the float gently in the chamber it supposed to go to the bottom of chamber with no restriction, after that fill the chamber slowly with water the float supposed to go up freely. Mine did not operate freely because the chamber was oval, I did'nt take the risk to brake the chamber wall by binding, I just milled the inside slightly just as enough to permit the float to operate freely. By the.. way check if the float is not upside down, top is indicated on it. Hope this help Joe Ferguson
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