Abstract: The present invention involves a system and method of oxidizing carbon monoxide in a preferential oxidizer for a hydrogen reformer of a fuel cell system for vehicular and stationary applications. The method includes providing a heat exchange system of the preferential oxidizer, wherein the heat exchange system has a single integrated oxidation reaction region in which an oxidation catalyst is disposed for oxidizing carbon monoxide to carbon dioxide. The method further includes introducing a hydrogen-rich reformate to the heat exchange system, wherein the hydrogen-rich reformate is at a predetermined temperature and has a first content of carbon monoxide. The method further includes injecting oxygen to the hydrogen-rich reformate, wherein the oxygen is at a predetermined stoichiometric oxygen/carbon monoxide ratio.

Abstract: An assembly 10 for metering fluid, including an intensifier 12 which selectively receives fluid from a supply 74. The intensifier 12 includes a reciprocally moving plunger 24 which selectively pushes the fluid through the intensifier 12 at a desired flow rate.