Patent ID: 8887698

Claim:
A fuel feed system which causes liquid fuel to evaporate so as to feed gaseous fuel, the fuel feed system comprising: an evaporator which includes a heater which heats the liquid fuel to vaporize the liquid fuel; a liquid fuel feed system which feeds the evaporator the liquid fuel; and a gaseous fuel feed system which is connected to the evaporator; and a temperature adjusting system which adjusts a temperature of the heater, wherein the heater has a heat conduction surface which supplies heat to the liquid fuel, the heat conduction surface has a temperature at which a heat flux becomes a local maximum when the fuel changes from a nucleate boiling state to a transition boiling state, the system includes a first sensor disposed on the heat conduction surface to detect the temperature of the heat conduction surface of the heater, and a second sensor disposed on the gaseous fuel feed system to detect a boiling point of the fuel at the evaporator, to calculate a difference between the temperature of the heat conduction surface of the heater and a boiling point of the fuel at the evaporator as the basis to make the temperature adjusting system change the temperature of the heater and adjust the heat flux at the heat conduction surface, and the temperature adjusting system adjusts the temperature of the heater so as to approach a temperature where the temperature of the heat conduction surface becomes the local maximum.