10 inch banjo question

I have a banjo burner and when I first used it, it would rock out big time BTU's. Now, I cant get a nice flame. The Blue Rhino tanks almost full. Only one batch was used with in at a second was started yesterday. The last batch that was done took about an hour to bring to a boil. Its way too long.

Is the problem with the low flame a regulator problem, an air-intake problem, or a pressure problem? Do the banjo burners need to be cleanened, and if so how is it done. How do I get a hotter flame.

Probably needs some cleaning as the ports get clogged from rust or spiders get in the tubing/piping, etc. Take it apart and clean it.

As for the flame, ideally you adjust the air intake so you get a nice clean BLUE flame.