"Rich, I believe that small screw you mentioned for draining the carburetor actually drains the "fuel sediment cap." When I opened the screw, about an eighth of a cup of gas drained out, and there were some small black specks of dirt in the gas."
I am sure that is correct as we know little about motors. Do you have the filter screen under the gas cap?? that should keep out dirt. I did dran that cup yesterday and the fuel was clean.
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