Do verify the spark first. And verify the solenoid on the carb is getting power. Be ready to do the tests immediately when it fails. Also try loosening the gas cap just to verify it is not creating a vacuum in the tank.
Then have a clean glass ready. With the fuel valve open, remove the drain plug from the carb bowl, be ready to catch the flow in the glass. If there is no fuel pump, the flow should continue in a stream, not slow to a drip or stop.
Look at what was caught. If it is dirty, or water on the bottom, the same will be in the tank.
If the flow stops, there is a restriction somewhere. Likely causes are a restricted screen inside the tank, the screen in the sediment bowl, possibly a screen in the inlet fitting at the carb, or trash caught up at the needle seat.
If there is a fuel pump, crank the engine through, see if flow begins at the bowl drain. If not start tracking back to the tank, see where the restriction is.
If this is a gravity system, adding an inline filter may cause more problems than it solves. Plus it will destroy your factory line.
As for the carb, chances are if the fuel tests dirty, the carb will have some contamination. Usually you can ease the bowl off without tearing the gasket, and clean it out. They are simple, just work over a clear surface so no screws get lost.
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