A liquid fuel supply and evaporator system for use in connection with combustion-powered fastener-driving tools comprises an evaporator housing which is disposed in thermal communication with the combustion chamber housing of the tool in order to absorb heat or thermal radiation generated within the tool combustion chamber. A sintered metal liquid fuel evaporator element is interposed between the evaporator housing and a liquid fuel distribution manifold whereby the liquid fuel is effectively converted into a gaseous fuel which is then transmitted by a gas distribution manifold toward the combustion chamber of the fastener-driving tool.