alc is probably alcohol and kero is probably kerosene. They are definitely not the same fuel!
Capt., sorry, guess I did not make myself clear on the fuel being used, alcohol/kerosene. The fuel is kerosene, being used in a Taylors 030 stove, which uses the pre heat cups below the burners, in which the alcohol is used for the pre heat process only.
The problem was my fault, without question, in that I apparently did not tighten the sealing gasket nut on the underside of the cup enough after rebuilding the oven burner. I have come to this conclusion as I removed the stove from the boat and used the same gasket in the reassembly process, I discovered the loose nut, and have since bench tested the stove with positive results for two hours.
This oven burner is difficult to install due to space and the need for using two wrenches together, blindly, in order to align it properly. (Not an excuse, just a fact). I will not, in the future, attempt to rebuild the oven burner without removing the stove. The top burners are very simple as access is fine and it is easy to see the underside of things to better check for leaks.
There was no spillage, in this instance, as there was no alcohol appearing on the floor of the stove under the burner, before lighting, as occurs in an overfill situation. This was the first time the burner was being tried after the rebuilding, and I was looking for that, which has occurred on occasion in the past.
I use a long tube, 20 inches, on a squeeze container to fill the cups, which I have found to be very effective so far. I did not realize that after filling cup that the alcohol, from the cup was leaking from the hole in the bottom of the cup as the alc in the cup was burning properly on the surface. When the burner knob was turned, the flare up from the kerosene, which is somewhat typical, apparently ignited the alcohol, which had run under the stove, down the copper tube from the burner, and into the rear compartment behind the stove. It was also burning under the stove.