Patent ID: 7892696

Claim:
A fuel cell system comprising: a power generation module; a liquid fuel container configured to hold a liquid fuel used in the power generation module while allowing the fuel to be supplied to the power generation module; a container mounting portion on which the liquid fuel container is detachably mounted, wherein the liquid fuel container comprises: a liquid fuel holding section being configured to hold the liquid fuel; and a coloring agent disposed in at least part of the outer peripheral portion of the liquid fuel holding section, the coloring agent being configured to change the color of the liquid fuel when the coloring agent comes in contact with liquid fuel leaked from the liquid fuel holding section, wherein the container mounting portion has an inlet port through which the liquid fuel is supplied from the liquid fuel container into the power generation module, and wherein the liquid fuel container further comprises a product holding section that is configured to collect and hold water generated by electric power generation in the power generation module, the coloring agent is placed in part of the outer peripheral portion of the liquid fuel holding section and part of an outer peripheral portion of the product holding section, for changing color of the liquid fuel or the water such that the liquid fuel and water differ in color from each other when the color agent contacts the liquid fuel leaked from the liquid fuel holding section or the water leaked from the product holding section.