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You say you added fresh fuel a month ago. That doesn't mean you're getting fresh fuel to the carb. Keep in mind that the fuel pickup tube doesn't go to the bottom of the tank - they usually end about an inch or so above the bottom. And guess what collects in the bottom of the tank - water (plus other mung). The fuel floats on top of that.
You've got to get a separate line to the bottom of the tank and use a hand pump to pull a gallon into a glass jug (so you can see what's there). In my boat, I can snake a piece of 1/4" PEX tubing through the fuel fill to the bottom of the tank. Last time I had fuel problems, I pumped out a gallon - that was half water. The gas went back into the tank, and the water was otherwise disposed of. Oh yeah, had to replace the o-ring on my fuel fill cap.
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