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Feedstock delivery systems for hydrogen generation assemblies having a hydrogen-producing region and a heating assembly. The delivery system provides a hydrogen-production fluid to the hydrogen-producing region and provides a heating fuel to the heating assembly. The delivery system includes a press

Feedstock delivery systems for hydrogen generation assemblies having a hydrogen-producing region and a heating assembly. The delivery system provides a hydrogen-production fluid to the hydrogen-producing region and provides a heating fuel to the heating assembly. The delivery system includes a pressure vessel having an interior cavity containing the heating fuel and the hydrogen-production fluid, which are disposed in the pressure vessel in a pressurizing--pressurized relationship, in which the heating fuel is discharged from the pressure vessel under it own pressure and the hydrogen-production fluid is discharged under pressure applied by the heating fuel. The feedstock delivery system may separately discharge the hydrogen-production fluid and the heating fuel and may include a pressure transmitter disposed between the hydrogen-production fluid and the heating fuel. The heating fuel may be a condensable fluid and the hydrogen-production fluid may be a liquid at the operating conditions of the feedstock delivery system.

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We claim: 1. A hydrogen generation assembly comprising: a pressure vessel adapted to receive a heating fuel and a hydrogen-production fluid; a heating fuel disposed within the pressure vessel for delivery under its own pressure to a heating assembly; a hydrogen-production fluid disposed within the

We claim: 1. A hydrogen generation assembly comprising: a pressure vessel adapted to receive a heating fuel and a hydrogen-production fluid; a heating fuel disposed within the pressure vessel for delivery under its own pressure to a heating assembly; a hydrogen-production fluid disposed within the pressure vessel at least substantially separate from, and having a different composition than, the heating fuel for delivery to a hydrogen producing region under pressure applied by the heating fuel; a hydrogen-producing region adapted to receive the hydrogen-production fluid from the pressure vessel and to produce a stream containing hydrogen gas as a majority component therefrom; and a heating assembly adapted to receive the heating fuel from the pressure vessel and to combust the heating fuel. 2. The hydrogen generation assembly of claim 1, further comprising a valve assembly in fluid communication with the pressure vessel and adapted to selectively and separately discharge the hydrogen-production fluid and the heating fuel from the pressure vessel under pressure applied by the heating fuel. 3. The hydrogen generation assembly of claim 2, wherein the valve assembly includes a three-way valve adapted to discharge the heating fuel, to discharge the hydrogen-production fluid, or to prevent the discharge of both the heating fuel and the hydrogen-production fluid, selectively. 4. The hydrogen generation assembly of claim 3, wherein the three-way valve is adapted to discharge the heating fuel until a predetermined condition occurs prior to discharging the hydrogen-production fluid. 5. The hydrogen generation assembly of claim 4, wherein the valve assembly is adapted to automatically switch between discharging the heating fuel and discharging the hydrogen-production fluid upon the occurrence of the predetermined condition. 6. The hydrogen generation assembly of claim 4, wherein the predetermined condition includes a predetermined amount of elapsed time. 7. The hydrogen generation assembly of claim 4, wherein the predetermined condition includes a predetermined operating temperature of the hydrogen generation assembly. 8. The hydrogen generation assembly of claim 4, further comprising a controller adapted to automatically switch between discharging the heating fuel and discharging the hydrogen-production fluid upon the occurrence of the predetermined condition. 9. The hydrogen generation assembly of claim 8, wherein the predetermined condition includes a predetermined amount of elapsed time. 10. The hydrogen generation assembly of claim 8, wherein the predetermined condition includes a predetermined operating temperature of the hydrogen generation assembly. 11. The hydrogen generation assembly of claim 1, wherein the heating fuel is discharged through a first discharge orifice and wherein the hydrogen-production fluid is discharged though a second discharge orifice. 12. The hydrogen generation assembly of claim 1, wherein the heating fuel and the hydrogen-production fluid are at least substantially immiscible. 13. The hydrogen generation assembly of claim 1, further comprising a pressure transmitter disposed within the pressure vessel dividing the vessel into a pressurizing chamber and a pressurized chamber, wherein the heating fuel is disposed in the pressurizing chamber and wherein the hydrogen-production fluid is disposed in the pressurized chamber. 14. The hydrogen generation assembly of claim 13, wherein the pressure transmitter includes a substantially inflexible member movably disposed within the pressure vessel and adapted to adjust the relative volumes of the pressurizing chamber and the pressurized chamber to maintain a substantially constant pressure on the hydrogen-production fluid. 15. The hydrogen generation assembly of claim 13, wherein the pressure transmitter includes a flexible diaphragm secured at its periphery to an interior surface of the pressure vessel and adapted to adjust the relative volumes of the pressurizing chamber and the pressurized chamber to maintain a substantially constant pressure on the hydrogen-production fluid. 16. The hydrogen generation assembly of claim 13, wherein the pressure transmitter includes a collapsible bladder, and wherein the hydrogen-production fluid is disposed in the bladder. 17. The hydrogen generation assembly of claim 1, wherein the hydrogen-production fluid comprises methanol and water. 18. The hydrogen generation assembly of claim 1, wherein the heating fuel is a low molecular weight, condensable fluid. 19. The hydrogen generation assembly of claim 1, wherein the pressure vessel is maintained at a pressure of at least approximately 100 psi and less than approximately 250 psi during operation of the hydrogen generation assembly. 20. The hydrogen generation assembly of claim 19, wherein the pressure vessel is maintained at a pressure of approximately 200 psi during operation of the hydrogen generation assembly. 21. The hydrogen generation assembly of claim 19, wherein the heating fuel is at vapor-liquid phase equilibrium during operation of the hydrogen generation assembly. 22. The hydrogen generation assembly of claim 1, wherein the hydrogen-production fluid is discharged at a pressure of at least approximately 100 psi and less than approximately 250 psi. 23. The hydrogen generation assembly of claim 1, wherein the hydrogen-producing region is adapted to produce the stream containing hydrogen gas via a steam reforming reaction, and further wherein the hydrogen-production fluid includes water and at least one carbon-containing feedstock. 24. The hydrogen generation assembly of claim 23, further comprising a separation region adapted to receive the stream containing hydrogen gas and to separate the stream into at least a product hydrogen stream and a byproduct stream. 25. The hydrogen generation assembly of claim 24, further comprising a fuel cell stack adapted to receive at least a portion of the product hydrogen stream.