TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Components: The fuel cell system includes element for vaporizing the feed stream produced in the feedstock delivery system. The sensor assembly is adapted to detect a first triggering event related to the gravimetric quantity of a first one of the water or the carbon-containing feedstock delivered to the reservoir, and a second triggering event related to the gravimetric quantity of either a second one of the water or the carbon-containing feedstock or the total amount of water and carbon-containing feedstock delivered to the reservoir. Each triggering event includes a measurable event in which a predetermined threshold value or range of values representative of a predetermined amount of water, carbon-containing feedstock, or the total liquid in the reservoir is reached or exceeded. The sensor assembly detects a first triggering event related to the gravimetric quantity of a first one of the water or the carbon-containing feedstock present in the reservoir, and a second triggering event related to the gravimetric quantity of either a second one of the water or the carbon-containing feedstock or the total amount of water and carbon-containing feedstock present in the reservoir. Each triggering event includes a measurable event in which a predetermined threshold value or range of values representative of a predetermined amount of one or more of the water, the carbon-containing feedstock, or the total liquid in the reservoir is reached or exceeded. The sensor assembly includes sensor external the reservoir or sensor internal the reservoir.The sensor assembly includes sensor located partially within the reservoir and partially external the reservoir. The reservoir includes a mixing device adapted to promote mixing of the carbon-containing feedstock and the water in the reservoir. The reservoir includes an emulsion-producing device adapted to produce an emulsion of the water and the carbon-containing feedstock. The feedstock delivery system further includes a controller adapted to regulate the flow of the streams into the reservoir at least partially in response to the triggering event detected by the sensor assembly. The reforming region is adapted to produce a mixed gas stream containing hydrogen gas and other gases from the feed stream and the fuel processor further includes a separation region adapted to separate the mixed gas stream into a product stream containing at least substantially pure hydrogen gas and a byproduct stream containing at least a substantial portion of the other gases.The separation region is in fluid communication with a polishing catalyst bed including a methanation catalyst. The separation region separates the mixed gas stream into the product stream and the byproduct stream via a pressure swing adsorption process. The separation region includes at least one hydrogen-selective metal membrane. The first triggering event is related to a gravimetric quantity of the first feedstock component delivered the mixing chamber. The second triggering event is related to a gravimetric quantity of the second feedstock component delivered to the mixing chamber.Preferred Method: The method further includes vaporizing the liquid stream withdrawn from the mixing chamber, and removing impurities from the stream containing hydrogen gas produced from the portion of the liquid stream. The removing step includes utilizing hydrogen-selective membrane or pressure-swing adsorption to remove impurities from the stream containing hydrogen gas.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The carbon-containing feedstock is selected to be soluble in water, or to form an emulsion with water. The carbon-containing feedstock further includes a surfactant. The carbon-containing feedstock includes an alcohol.