When you ran out, sis you have to open the cylinder valve on the inside tank? If so, you may have opened it too fast and it activated the excess flow valve and shut off the flow. Then when you switched the cylinders it released and worked correctly.
If it was already open and didn't work, it could be a switch over regulator not switching.
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Salem 29RKSS Pushing a GMC Sierra 2500HD!
Gotta go campin!
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