Your float valve may be bad, or you may have something hung in the orifice. I would pull the bowl, turn the gas on, and watch the flow, then lift the float, and see if it shuts off. If not, you need a cleaning or a float valve. With good parts, the factory setting on the float, should be good enough to stop the leaking.
Remove the float needle and examine the tip with a magnifier, some of them are coated with Viton, I had one that the ethanol swelled, if the needle is indented this can also cause the issue
do not set the float to 1/4" you can starve the motor, 3/16" as stated is correct
Check the condition of the o-ring on the main jet. My bendix was doing the same thing...checked/adjusted float, removed/replaced valve, still just poured fuel in at idle. Then noticed a tiny crack in the o-ring on the jet, replaced that...problem solved.
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