The 2 most common causes of true flooding are trash in the fuel tank and a partially sunk float.
Take a fuel sample from the drain plug in the bottom of the carb in a clean glass. Hold it up and look at it, if there is trash, rust chunks in the fuel, the tank is contaminated and will be a continuing source of problems.There should be a screen in the tank,one on top of the sediment bowl and one in the inlet fitting of the carb. If those are in place and it is still getting trash, the problem is severe. A rust flaking tank will be an ongoing source of frustration. Inline filters do not work well with gravity systems.
If the float has a hole in one of the pontoons, it will not have enough buoyancy to stop the fuel flow. Give it the shake test, see if you can feel or hear fuel inside it, or float it in a container of gas, it should float evenly. Also be sure the float is not twisted or bent, and not touching the inside of the bowl.
Once the carb is clean, the float level is set (the specs are available online, along with pages of carb information) the seat is tight and the gasket in place, before you put the bowl on, turn the top upside down, suck on the fuel inlet fitting, put your tongue over the hole. You should feel it hold vacuum. If it won't hold, there is still a leak somewhere.
But, I have to ask, are you sure it is truly flooding? If you just turn the gas on and do not try to start it, will it start dripping? Or if left idling for a few minutes, will it load up, black smoke, die, and be flooded when trying to start again?
If yes, then it is flooding.
But if it only drips following a failed start or a few drops when shut off, it may not be flooding. That is normal for an up draft, what happens is liquid fuel drains back down off the inside walls of the intake, especially on a cold day and a cold engine.
Always be sure the engine is properly tuned, especially the points adjusted and clean before blaming or attempting to adjust the carb. The poor thing can only work as well as the rest of the engine will let it!
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