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This one could prove to be one that is not able to be remedied without actually being able to see it, but I will give it a try.
The fact that it will start back up tells me that is most likely not ignition related - but we need to keep that option open.
My first thought is that it may be suffering vapor lock.
Is the fuel line routed too close to the engine or exhaust manifold?
One thing you could try to rule out or confirm vapor lock is to install a fan that blows on the carb and fuel line. If the set will continue to run with a fan blowing on it, we have most likely found the problem.
Another possibility is a bad fuel pump.
To test it, let the genset get hot, and shut it down.
Immediately remove the fuel line from the carburetor and place it into an empty container.
Crank the engine for a few seconds and watch the fuel flow. This will not have a particularly strong stream, but it should be 'pulsing' as the engine cranks.
Does it appear to have enough fuel flow?
Another possibility is that the stepper motor controller is overheating and shutting the set down.
Here is how to test it:
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If none of this finds the problem, let me know and we can check some other things.
Yes, I realize it is an impulse pump.
The issue could be (just a thought - no guarantees), that if the diaphragm is getting too hot, and getting too soft, it may not be stiff enough to pump fuel.
Another possibility with it is if the engine crankcase is loosing vacuum/pressure for whatever reason, it may not be able to drive the pump.
It is not a very expensive part, but I personally would not change it unless it tests bad.
You know, I really couldn't say - I've never been asked that, and have never had a reason to check.
But, I would doubt it. The problem would be the fuel pressure.
The pulse pump has virtually no pressure to it - maybe 1-2 psi?
I'm not sure of you could find an electric pump that would guarantee that low of a pressure.
Too much pressure and you will blow the seat out of the carb.
Not a problem.
Let me know what you find.