You will first have to determine where the fuel is coming from. As old kid said check the bowl drain, if float is stuck fuel will come from one of two vents. One being on right side of carb the other from fuel drain hose. Also check your oil for fuel. If you are using the stock vacuum pump under tank, sometimes if the diaphragm goes bad the fuel will flow around the diaphragm and through the vacuum side into the intake manifold. To check just pull the vacuum line off intake and look for traces of fuel in that line.
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