a vaporizing type liquid fuel combustion keyboards is disclosed which is particularly suitable for heating individual rooms and which includes a fuel supply system capable of delivering very small volumes of fuel reliably and without the need for excessively complicated components . the apparatus includes an intermittently driven electric fuel pump which is controlled by a flame detector for the the fuel feed at a proper level . an adjustable damper is also provided in the combustion air supply system for regulating the air flow delivered to the combustion apparatus , and is coupled to the fuel feed system for coordinating control thereof . bridge irregularities