NOVELTY - A fuel processing system includes feedstock delivery system for regulating the flow of streams containing water. The feedstock delivery system comprises delivery assemblies for water and carbon-containing feedstock, and sensor assembly. The carbon-containing feedstock in response to the detection of triggering event produces a feed stream.    USE - The fuel processing system is useful as fuel cell system for use in producing hydrogen gas. It may be combined with energy-consuming device e.g. motor vehicle such as recreational vehicle, automobile, boat or sea craft, with dwelling e.g. house, apartment, duplex, apartment complex, office or store, with self-contained equipment e.g. microwave relay station, transmitting assembly, remote signaling or communication equipment.    ADVANTAGE - The system provides high purity of hydrogen supply.    DETAILED DESCRIPTION - A fuel processing system comprises a fuel processor (12) for producing a product steam containing hydrogen gas from a feed stream (16), and a feedstock delivery system (26) for delivering a feed stream containing a predetermined mix ratio of feedstock components to fuel processor.    The feedstock delivery system comprises a water delivery assembly for providing stream containing water, a carbon-containing feedstock delivery assembly for providing a stream containing a carbon-containing feedstock, and sensor assembly for detecting triggering even related to the quantity of feedstock components in the reservoir. The feedstock delivery system regulates the flow of the streams containing the water. The carbon-containing feedstock in response to the detection of triggering event by the sensor assembly to produce a feed stream containing a predetermined mix ratio of the water and carbon-containing feedstock.    An INDEPENDENT CLAIM is included for a batch method for producing a feed stream for a fuel processor comprising:    (1) delivering a first feedstock component until a sensor assembly detects the occurrence of a first triggering event corresponding to the first feedstock component being feed;    (2) delivering a second feedstock component until a sensor assembly detects the occurrence of second triggering event corresponding to second feedstock component and property of mixture of two feedstock components;    (3) delivering the two feedstock components as feed stream to fuel processor containing a reforming region; and    (4) producing a product hydrogen stream containing hydrogen gas from the feed stream.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of the fuel cell system with feedstock delivery system.    Fuel processor (12)    Feed stream (16)    Feedstock delivery system (26)