Assuming the pair are identical models
And both started with full tanks
And you need both to power the load
They will both ruin out very close together
But if you are powering a load that is too great for only one generator
The one that stayed running is going to trip it's circuit breaker, or do an inverter overload,
I can explain it to you.
But I Can Not understand it for you !
....
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1997 F53 Bounder 36s