I had a similar problem, very very low flame on burners. Where really you could not cook on the grill. I found out I was lighting the grill the wrong way. With all of your burner knobs off, open the tank valve allowing the propane gas to enter the regulator and flow on both side of the diaphragm inside the regulator. Only takes about a good 5 seconds. Then you open your burner valves. Never had that problem again. Now if your gas tubes and burners are clear (no spider webs) and your tank is filled yes it can be a faulty regulator. You can buy a new regulator in Home Depot. Once I had a float in the propane tank get stuck had to change out tank.
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