“...capable of running until the fuel is turned off
a feat previously thought impossible...”
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Ain’t that what all engines do?
LOL! I guess you just don't understand science!
That’s the way my non-electronic diesel works on my little tractor. With gas engines though, they will die when the spark is cut off. Whether supplies by a battery, generator, alternator or magneto, they need electricity to run. A mechanical diesel does not. I have to pull a little lever that cuts off fuel to stop the engine.