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Try this.. Turn the tank on slowly ,then turn off and turn back on slowly again. Tanks with OPD valves have an excess flow built into them and this causes most of the problems with the tanks. The colder it gets the more they seem to act up! If you turn the valve on too fast it will lock up and only let a small amount of gas through. When this happens and you turn it back off you can hear a faint click when you get the valve fully closed. I can't count how many people have brought tanks in complaining the valves are junk and this is the problem. I've showed my wife i don't know how many times how to light the gas grill and she still has problems with this.