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I have run gas Hondas for at least 15 years at operating speed until they run out of fuel with no harm.
however when an engine runs out of fuel it does not just stop all at once nor do I run them at...

To clarify, my reply in post #2 was to shut the pump off if the tank got full. For the vacuum pump in regards to temp, I checked the forecast and only put in enough fuel to run until about 2 hrs...

I just have it close a switch that shorts the spark.