Beckett AFG Oil Burner. Burner continually starts with a thump, runs a few seconds, then thumps again and runs briefly before another thump. This can last a day or two, then it will start and the Honeywell Protectorelay® Oil Burner Control R8184 G4009 red button will pop. Removing the nozzle and cleaning the nozzle filter will give another day or two of the thump cycle operation. I believe there is a fuel supply problem and am eager to fix it. I cleaned the nozzle several times and the burner would run for a few days without interruption. I replaced the nozzle with a new one, but now the burner quits after about 2 minutes. The LED illuminates and the red reset button pops.Your help would be greatly appreciated. Thanks.