I had a 30 lb cylinder recently that had the same problem. Wasnโt the auto-switch regulator, wasnโt the pigtail causing the problem. I ended up having to have the tank valve replaced. The LP dealer tech confirmed the problem with his equipment. I donโt know what can go wrong with the OPD valve to make it fail that way, but it did.
Fortunately, the valves arenโt expensive, and it counts as a tank recertification as long as they mark the tank accordingly.
:):)
2001 Lance 1121 on a 2016 F450 โScuse me while I whinge.
And for all you Scooby-Doo and Yosemite Sam typesโฆโฆโฆ..Letโs Go Brandon!!!