If You haven't, clean the screen in the fuel tank (if it has one) as well as the tank as they tend to collect debris, and as far as an electric pump or such, no sense reinventing the wheel, as the factory pump is not problematic.
Either they are worn out after many years, or a cheap import substitute.
Also, sometimes the elbow right at the carb where the fuel hose attaches collects debris.
Have you checked to see if you have spark when it quits operating??
Sometimes an old coil will fail when hot after many years of use but start up when cool.
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