It is normal for an updraft to leak a few drips after a shut off, and especially after a failed choke assist start. It is simply fuel running back down out of the intake.
A true flooding carb will idle rich, load up and die, black smoke, and will continue to drip any time the fuel valve is on and not running. In severe cases it can even fill the air cleaner tube to the point of filling the engine with fuel.
But, if it is flooding, one of the most common causes is trash under the needle valve and the seat. It can come down the fuel line, or it can get in the inlet fitting while trying to connect the fuel line. It only takes a tiny speck. Try removing the drain plug, let the fuel run out into a clean glass, see what you catch. If there are rust flakes, the tank is contaminated and will need to be cleaned or in severe cases, replaced. Also be sure the sediment bowl is clean, and the screen is in place. There should also be a screen where the sediment bowl screws into the tank.
Once clean fuel is established, sometimes draining the carb will allow the needle valve to open far enough for the trash to flush out.
Other causes are a bent float hitting the inside of the bowl, or one of the pontoons filled with fuel. Give it the shake test, should not feel or hear fuel inside the float.
Check the seal of the needle valve. Be sure the seat is tight against the gasket. Turn the upper half of the carb upside down with the weight of the float resting on the needle. Suck on the inlet fitting, hold your tongue over the fitting. It should hold vacuum. If not, it is still leaking somewhere. Could be the needle or the seat is nicked or defective. Look closely, it doesn't take much. There should be a slight ring around the needle where it seats in the seat. The seat must be perfectly smooth, no nicks or imperfections. Sometimes it can be lapped with a Qtip in a drill with lapping compound.
Don't be discouraged, those are easy carbs to service. Keep after it and it will work. The originals are better than the new aftermarkets.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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