NOVELTY - A hydrogen gas generator has a sealable pressure tank (26), and an alkaline metal introduction system (23) with a pump (68) connected to a tank and feed incremental amounts of the alkaline metal from the supply tube assembly into the pressure tank while the tank remains sealed from ambient air, without significant loss of hydrogen pressure.    USE - For use in electrical power generation system.    ADVANTAGE - The inventive hydrogen gas generator releases hydrogen from ordinary water to form a non-polluting totally recyclable system.    DETAILED DESCRIPTION - A hydrogen gas generator comprises a sealable pressure tank for holding the water into which the alkaline metal is to be introduced and for holding hydrogen gas produced by the chemical reaction between the alkaline metal and the water. The pressure tank also include sealable opening(s) for introducing water and outletting hydrogen gas. An alkaline metal introduction system comprises a pump connected to the tank and feed incremental amounts of the alkaline metal from the supply tube assembly into the pressure tank while the tank remains sealed from ambient air, without significant loss of hydrogen pressure.    INDEPENDENT CLAIMS are also included for;    (1) An electrical power generation system comprising the above hydrogen gas generator, and a fuel cell operatively connected to the hydrogen gas generator for receiving hydrogen from the pressure tank and carbon dioxide free air bubbled through sodium hydroxide produced in the pressure tank to produce electricity; and    (2) A supply tube assembly (149) for use with a peristaltic pump to dispense incremental amounts of a material comprising an outer tube made of resilient material which is non-reactive with alkaline metal(s). The outer tube is sealed at one end and sealable at a removably sealable at an opposite removably sealable end. The material comprises an alkaline metal, which is non-reactive with the material from which the outer tube is made. The alkaline metal is contained within the outer tube.    DESCRIPTION OF DRAWING(S) - The figure is a schematic top plan view of the hydrogen generator.    Alkaline metal introduction system (23)    Sealable pressure tank (26)    Pump (68)    Pump drive assembly (107)    Supply tube assembly (149)