NOVELTY - A hydrogen generation system comprises a fuel supply reservoir containing an aqueous solution of at least one metal hydride; fuel pump to withdraw the solution and contact it with a hydrogen generation catalyst; gas-liquid separator; condenser; condensate recovery zone; and mixing zone to combine the condensed water with the aqueous solution of metal hydride withdrawn from reservoir, thus diluting the solution prior to contact with catalyst.    USE - For generation of hydrogen useful in a hydrogen fuel cell.    ADVANTAGE - The internal recycle line permits the use of a more concentrated solution of metal hydride as it is diluted by the recycle line prior to contact with the catalyst. The system provides economy of being able to store and utilize a concentrated metal hydride solution fuel supply. This allows the use of smaller fuel reservoir without sacrificing the duration of hydrogen generation between refueling the system. The addition of water from the recycle line maintains a dilute fuel feed, thus reducing the possibility of the system becoming clogged as a result of the water being used up to the point where there is insufficient water exiting the catalyst chamber to maintain a product salt in solution. The water exiting the condensate recovery tank is at a lower temperature than in the catalyst chamber, thus it functions as an aid in controlling the temperature of the reaction, which is exothermic.    DETAILED DESCRIPTION - A hydrogen generation system comprises a fuel supply reservoir containing an aqueous solution of at least one metal hydride; fuel pump to withdraw the solution and contact it with a hydrogen generation catalyst to generate a fluid product stream comprising hydrogen, water, and salt of the metal; gas-liquid separator to separate the fluid stream into a gaseous product comprising hydrogen and water vapor, and a liquid comprising water and the metal salt; condenser in fluid flow communication with the gaseous product to condense water; condensate recovery zone to recover the condensed water; and mixing zone to combine the condensed water with the aqueous solution of metal hydride withdrawn from reservoir, thus diluting the solution prior to contact with the hydrogen generation catalyst.    DESCRIPTION OF DRAWING(S) - The figure is a block diagram of the improved hydrogen generation system.