NOVELTY - Producing (P1) hydrogen gas involves mixing a hydrocarbon fuel with some of water and heating both until hydrocarbon fuel and water react to produce reactant gases; removing some hydrogen gas from reactant gases to produce raffinate gases; providing a hydrogen separator containing a hydrogen permeable surface with a first side and a second side; producing steam from the water; exposing first side of hydrogen permeable surface to raffinate gases; and flowing some of steam across second side, and sweeping hydrogen away from hydrogen permeable surface.    USE - For producing used to generate power (claimed).    ADVANTAGE - The process provides single stage fuel processing system. The fuel processing system is carried within the automobile or ship to obtain ultra pure hydrogen from traditional fuel in a single stage process that operates on an as-needed basis. The ultra pure hydrogen can then be used to power a fuel cell for the energy efficient production of electrical power.    DETAILED DESCRIPTION - Producing (P1) hydrogen gas involves providing a hydrocarbon fuel; providing water; mixing the hydrocarbon fuel with some of water and heating both until hydrocarbon fuel and water react to produce reactant gases; removing some hydrogen gas from reactant gases to produce raffinate gases; providing a hydrogen separator containing a hydrogen permeable surface with a first side and a second side; producing steam from the water; exposing first side of hydrogen permeable surface to raffinate gases, where hydrogen from reactant gases passes through hydrogen permeable surface to second side; and flowing some of steam across second side, and sweeping hydrogen away from hydrogen permeable surface. An INDEPENDENT CLAIM is included for generating power (P2) involving providing a fuel cell that operates using hydrogen gas; providing a hydrocarbon fuel; providing water; reacting hydrocarbon fuel with some of water in a heated environment to produce reactant gases; removing some hydrogen gas from reactant gases to produce raffinate gases; producing steam with some of water; providing a hydrogen separator; passing raffinate gases through hydrogen separator to obtain hydrogen gas; sweeping hydrogen gas from hydrogen separator with some of steam; and supplying hydrogen gas to fuel cell, where the fuel cell produces power.