After experiencing the smell of propane intermittently for several months and soaping every connection and regulator I finally found my leak. On top of the tank where the valve threads into the tank I got slight bubbles with a soapy solution. Very slight but of course it does not take much of a leak to smell propane. I took the tank to a company who sells propane and they were authorized to replace the valve with a new one. Apparently the threads on the valve had been damaged somewhat and this prevented it from sealing good. You could actually see damage to the threads. Now I have no more leaks!!
