present in the chamber 43 when the fuel igniter is in operation porcelain materials and certain glasses are suitable for this purpose also the internal surface 47 of concave cap 46 preferably includes a coating 49 of similar material except in the area near exhaust port 48 additionally standard spark plugs are provided with porcelain coatings 38 adjacent to the sparking end 34 the coating 45 prevents arcing from the spark generating end 34 to the side wall 41 while the coating 49 is provided to focus the spark toward the exhaust port 48 in one specific embodiment the entire interior concave surface 47 of the cap 46 is coated with the non conductive material so that only the bar metal of the exhaust port 48 is an exposed cathodic surface in another specific embodiment the coating 49 terminates at a perimeter 49a about the port 48 so that an annulus 46a of bare metal around the exhaust port is exposed cathodic surface it will be understood that the dimensions given herein should not be considered to limit the application of the present invention the dimensions may easily be scaled to facilitate installation of the present fuel igniter into a variety of other devices including rockets internal combustion engines and the like also it is not essential that an automatic spark plug be used as a spark generator other components which may be used to generate a spark will be readily apparent to those skilled in the art in operation the fuel igniter of the present invention is connected to a power source through standard spark.