More than likely you are tripping the anti-surge valve. To avoid this, only open the tank valve when the ball valve is closed. You may have to shut the tank valve and open the ball valve to relieve the line pressure and reset the surge valve before proceeding. When shutting down, shut the tank valve first, then the ball valve. When starting up, open the tank valve slowly, but open it all the way, then open the ball valve and ignite the burner. The anti surge valve is supposed to prevent a huge rush of gas if the gas line is severed, burned or otherwise compromised. It does not shut the flow off entirely, but it will slow it to a trickle. If this does not cure the problem, post back and we can go to plan "B".Did you relieve the gas line pressure to reset the surge valve? It's possible that the regulator could be defective. Can you post a pic? I may be able to spot something that is not obvious to you. Usually the problem is having the the other valves open prior to opening the tank valve. If you post a pic, have it include the tank, the regulator, the valve(s) and the full length of the gas line to the burner. I'm sure it's something simple that is causing the problem.The ball valve is connected via 18" of 1/4" standard propane hose to the regulator with the red knob that comes with most turkey fryers.
It supplies the two needle valves, the one on the right goes through about 2' of 1/2" pipe, then back to about 6" of 1/4" hose to an orafice and a standard jet burner.
The left side goes through the needle valve, then to about 2' of 1/2" hose to the inlet of the tankless heater, which just has a simple solenoid valve that opens when I turn the tankless heater on.

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