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I have the same regulator. First be sure you are completely screwing the tank into the regulator. Mine will get very tight and makes you think it is completely screwed in but it is not. A couple more turns and it finally makes good contact. Second, once the tank is properly attached, turn the knob on top of the regulator clockwise as if you were tightening a nut. It is a reverse thread. Turn it until the working pressure guage measures between 15-20 psi. Once that is stable then you can use the needle valve to adjust the flow rate. If you do not turn the working pressure up enough you may be trying to get a bubble rate higher than what the regulator is letting out of your tank and that's why it seems like it is running out of gas.

My bet is that the tank was not completely screwed in to the regulator.
 
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