This invention pertains to a reformer- liquid fuel manufacturing system that utilizes an internal combustion engine to generate hydrogen-rich gas. The engine operates at very rich conditions. In doing so, it creates an exothermic reaction, which results in the production of syngas. The system uses the energy from the exothermic reaction to rotate a shaft and also applies the heat in the syngas to heat the reactants. A mechanical power plant is in communication with the rotating shaft and can be used to produce oxygen, provide electricity or operate a compressor, as required. The hydrogen-rich gas is supplied to a chemical reactor, which converts the gas into a liquid fuel, such as methanol.