Abstract: A fuel lock/converter having an integrated housing with a liquid fuel inlet port and a gaseous fuel outlet port. The outlet port discharges to an air/fuel mixer which acts as a carburetor and its demand controls this fuel lock/converter. Between the inlet port and the outlet port there is a fuel lock which closes in the absence of demand, and opens at any demand. A primary regulator valve regulates liquid flow to a converter, and gaseous fuel from the converter is regulated by a secondary regulator valve. The secondary regulator valve also acts as a fuel lock in the absence of demand.