I need to repair a leak where the fuel tube goes into the lower part of the burner body, in the picture the screwdriver points to the leak, a solder joint, and there is where I need help. Reading other threads I have the idea to use Mapp gas and silver solder, but I am concerned the heat will loosen the other joints in the burner that are so close. Should I completely remove the tube, clean it up, and resolder or try and get some flux down into the failed joint and just get a drop of solder there? All advice appreciated, I have sweat copper pipe before but never anything this small or tight. Edit to add - this leak is a steady stream of bubbles when the burner is submerged, and I do not see any other leaks.