When you shut it off how long did you let it drip?
What you may be seeing is residual fuel clinging to the inside walls of the intake, especially in cool weather. When the engine is shut off, the gas comes running back down because the air flow that was suspending it has stopped.
Try leaving it the gas on a couple minutes and see if it will stop.
When I assemble a carburetor, I like to turn the top upside down and suck on the fuel fitting, then put my tongue over the hole. It should hold vacuum. If it doesn't, something is leaking. Not necessarily the needle valve. If the seat did not fully screw down on the gasket it will leak.
Did you test the float for gas inside a pontoon? You can give it the shake test or float it in water, see if it floats evenly.
And finally, most flooding conditions are caused by rust flakes or trash in the tank. The fuel must be clean, only takes a tiny speck to hols the needle valve open, a sliver of rust can damage the sealing surface. There should be a screen in the inlet fitting of the carb, a screen on top of the sediment bowl, and a screen standing upright inside the tank. All three need to be in place and the tank clean and not flaking rust. If the tank is flaking or dirty it will continue to have problems.
Inline filters are not good with gravity systems. If you want to use an inline filter, find a screen type, not a pleated paper, they clog quickly and are too restrictive.
One other thing I like to do, before making the final fuel line connection to the carb, turn the gas on, let the line flush while you make the connection. This is especially helpful if the area around the fitting is crusty with dirt and grease.
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Today's Featured Article - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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