The clunk sounds like it could be the problem. I noticed when I pulled the tank out today. The clunk fell all the way back to the far corner. I have a #8 plug in it. #8 works fine for my 3 other 46's. I put a zip tie on the niddle valve. Tightend it down just enough so you can adjust it but it won't walk. I'll shorten up the clunk line tomorrow and see if that works. Thanks for your help. This ones driving me nuts.