I think you found your problem. It is possible that the fuel pump was operating, but just not able to get enough fuel due to the blockage you found in the screen. This is exactly what ethanol has done. In some cases, it breaks down the fuel tank or even the fuel lines, and the residue clogs carb jets or fuel pump screens. It is actually very common.
Do you have a 5 gallon portable gas tank that you have used for a number of years to fill up your lawn mower? If so, when it is almost empty, take a look in the bottom of the tank and you will see that brown gunk that you are talking about.
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Getting ready for winter!
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