For pinging, try turning off the offending tank, remove the hose like you were going to fill the tank to relieve the pressure in the hose, then reconnect the hose to the valve and this is the important part, open the valve very very slowly. New tank valves come with an excess flow valve that will shut off the propane if the hose breaks. Its this excess flow valve that is pinging.
Bill, Kathi and Zorro; '05 Beaver Patriot Thunder
2012 Sunnybrook Harmony 21FBS (SQEZINN)
2007 Jeep Grand Cherokee Overland