GMC Troubleshooting Questions? Ask a Mechanic for Answers
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Yes,it would have kept running until it ran out of fuel then stalled out and once this happened then with the key on then the battery would have drained out as well.It may have also shut off if for some reason it started to over heat while idling all night and in which the key would have been left on still and drained the battery.These are the two main reasons it would have stalled out and then the key would have been left on and drained out the battery here.
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