I had the same problem last month with my project. The unit would hold pressure to about 50-75 psi, but no higher. It would eventually leak down to 10 psi or so. I eventually found the leak with the soapy water method and 60 psi from an almost empty tank of torch gas. Turned out to be a crack in a bend. I suppose at low pressure it was holding itself shut.
Hope this helps. Good luck and godspeed
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