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Glen-
This something you might want to look for. When my rig was brand new and I used the first tank of propane and the regulator that was supposed to switch to the other tank failed because of another reason other than a faulty regulator.
My problem was the cross over pipe from the driver side tank was left with oil inside when the pipe threads were cut. I don't know whose responsibility to clean the inside of the pipe was, the supplier or Keystone at the assembly point. Regardless the oil was there and it caused quite a headache. Even after cleaning the pipe I still do not trust the system to perform as designed and physically switch tanks after the one on the door side in service goes empty. Hope this is not your problem.
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