A fuel supply system for an internal combustion engine operable using
hydrogen and/or for a fuel cell includes a hydrogen tank, which is
provided for storing deep-cooled, liquid hydrogen, and a heat exchanger,
which is provided for preheating the deep-cooled hydrogen. The heat
exchanger is enclosed by a fluid-tight mantle. An intermediate space is
provided between the heat exchanger and the mantle, which has a fluid
flowing through it, which delivers heat to the heat exchanger and
insulates the heat exchanger in relation to the surroundings.