PDIGIO_6x3
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KVH, I went through the gas overflow several times. It was always a stuck float valve. The fuel only has one way in, and one way to stop flow. That's the float valve. Setting the height of the floats is critical as you've seen, yet the problem for me was debris getting into the float valve between the needle and body, thus allowing a flooding condition. I've since installed a glass filter just before the carbs and haven't had a flooding issue since.