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Re: Maybe the fuel pump?
May not be your problem, but I just had a similar problem. Your gas cap may not be venting. This creates a vacuum in the tank that the fuel pump will finally not be able to overcome. Runs fine for a while, then starts to malfunction. Shut off the engine and let it sit for a while and the tank slowly releases the vacuum. Drive again, then the vacuum starts to build again. Same thing over and over. The more gas in your tank, the quicker the problem shows itself.
Remove your cap, put some duct tape over the fill port to keep it sloshing out, punch a small hole in it with an awl, and go test drive. If it keeps running, then fix the gas cap vent or buy a new cap.
Or possibly, your fuel filter is clogged. Change that out also. Most carbs have a small filter at the carb gas inlet. Sometimes there is another filter along the chassis. Check for those and replace also.
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