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The guy I work for has a 620 that we checked the engine oil in the other day and when we pulled the dipstick it was overfill to the point it ran out the tube. I shut off the gas and cleaned the carburetor bowl and put in a new needle and seat and tested and it didn’t leak. I drained the gas/oil mixture and left an empty bucket under it overnight and when I came back in the morning there was about two quarts of gas in the bucket. The gas to the sediment bowl was shut off and the carb was empty. How I still getting gas dripping from the drain hole on the block?