Originally Posted by stevebaz
When you open the tank to release propane do you open the valve all the way up until the knob stops. Some tank valves have a stem that seals when the valve is fully opened. I would soap test everything. You just may have to study the bubbles a while if it's a very slow leak.
Funny enough I had a propane guy explain the above to me just the other day. He suggested that if you only turn the tanks on part way that something he called an excess flow valve does not always works and can in some cases allow gas to leak around connection threads.
There suggestion was to always fully open the tanks then back them off a 1/4 turn in order to make sure the excess flow valve is activated.
Have no idea if the above is correct or not..... but the guy is in the propane businesses so suspect there may be some validity to the above.
Like the others though I would take the whole thing to someone who knows what they are doing as it not something I personally would be comfortable messing around with trying to fix if its not something as simple as the above.