Update from OP, me. It worked later that day when I tried it again. It actually may have been working all along, or flowing all along. What wasn't working was my generator comma my propane generator. It would start running about 5 seconds and then shut off like it wasn't getting any propane. So I'm guessing that when you run a tank dry while you're running a propane generator comma when you refill the tank it takes awhile for enough propane to get to the generator. The generator was an Onan 2500. Thoughts, gentleman? Ladies are also welcome to chime in.