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A pressure maintaining system for a hydrogen storage system includes a hydrogen supply feed that enables a hydrogen flow from the hydrogen storage system. A liquid phase hydrogen feed enables a liquid phase hydrogen flow to the hydrogen supply feed. A gas phase hydrogen feed enables a gas phase hydr

A pressure maintaining system for a hydrogen storage system includes a hydrogen supply feed that enables a hydrogen flow from the hydrogen storage system. A liquid phase hydrogen feed enables a liquid phase hydrogen flow to the hydrogen supply feed. A gas phase hydrogen feed enables a gas phase hydrogen flow to the hydrogen supply feed. A check valve enables fluid communication from the hydrogen supply feed to the liquid phase hydrogen feed when a pressure within the hydrogen supply feed is greater than a threshold pressure.

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What is claimed is: 1. A pressure maintaining system for a hydrogen storage system, comprising: a hydrogen supply feed that enables a hydrogen flow from said hydrogen storage system to a fuel cell stack; a liquid phase hydrogen feed that enables a liquid phase hydrogen flow to said hydrogen supply

What is claimed is: 1. A pressure maintaining system for a hydrogen storage system, comprising: a hydrogen supply feed that enables a hydrogen flow from said hydrogen storage system to a fuel cell stack; a liquid phase hydrogen feed that enables a liquid phase hydrogen flow to said hydrogen supply feed; a gas phase hydrogen feed that enables a gas phase hydrogen flow to said hydrogen supply feed, wherein said hydrogen supply feed includes a heat transfer device that transfers heat to one of said gas phase hydrogen flow and said liquid phase hydrogen flow; and a check valve that enables fluid communication from said hydrogen supply feed at a point downstream of said heat transfer device over said liquid phase hydrogen feed into said hydrogen storage system when a pressure within said hydrogen supply feed is greater than a threshold pressure. 2. The pressure maintaining system of claim 1 further comprising an insulated housing, wherein said liquid phase hydrogen feed and said gas phase hydrogen feed are disposed within said insulated housing and said hydrogen supply feed extends from said insulated housing. 3. The pressure maintaining system of claim 1 wherein said liquid phase hydrogen feed includes a conduit and a valve that enables said liquid phase hydrogen flow through said conduit. 4. The pressure maintaining system of claim 3 wherein said check valve enables fluid communication from said hydrogen supply feed to said liquid phase hydrogen feed at a point upstream of said valve when said pressure within said hydrogen supply feed is greater than said threshold pressure. 5. The pressure maintaining system of claim 1 wherein said heat is transferred from said gas phase hydrogen feed and said liquid phase hydrogen feed, respectively. 6. The pressure maintaining system of claim 1 wherein said heat is transferred from a coolant system. 7. The pressure maintaining system of claim 1 wherein said heat is transferred from an electrical heating system. 8. The pressure maintaining system of claim 1 wherein said hydrogen supply feed further comprises a shut-off valve that is operable between an open position and a closed position to regulate said hydrogen flow. 9. The pressure maintaining system of claim 1 further comprising a safety valve that is in fluid communication over said gas phase hydrogen feed, wherein said safety valve is operable to reduce a storage pressure when said storage pressure exceeds a tank threshold. 10. A hydrogen storage system that stores liquid phase hydrogen and gas phase hydrogen within a two-phase diagram of liquefied hydrogen or high-density hydrogen fluid outside of a two-phase boundary, comprising: a storage vessel; and a pressure maintaining system that regulates a hydrogen flow from said storage vessel and that comprises: a hydrogen supply feed that enables said hydrogen flow to a fuel cell stack; a liquid phase hydrogen feed that enables a liquid phase hydrogen flow to said hydrogen supply feed; a gas phase hydrogen feed that enables a gas phase hydrogen flow to said hydrogen supply feed, wherein said hydrogen supply feed includes a heat transfer device that transfers heat to one of said gas phase hydrogen flow and said liquid phase hydrogen flow; and a check valve that enables fluid communication from said hydrogen supply feed at a point downstream of said heat transfer device to said liquid phase hydrogen feed when a supply pressure within said hydrogen supply feed is greater than a threshold pressure. 11. The hydrogen storage system of claim 10 wherein said pressure maintaining system further comprises an insulated housing that houses said liquid phase hydrogen feed and said gas phase hydrogen feed and wherein said hydrogen supply feed extends from said insulated housing. 12. The hydrogen storage system of claim 10 wherein said liquid phase hydrogen feed includes a conduit and a valve that enables said liquid phase hydrogen flow through said conduit. 13. The hydrogen storage system of claim 12 wherein said check valve enables fluid communication from said hydrogen supply feed to said liquid phase hydrogen feed at a point upstream of said valve when said pressure within said hydrogen supply feed is greater than said threshold pressure. 14. The hydrogen storage system of claim 10 wherein said heat is transferred from said gas phase hydrogen feed and said liquid phase hydrogen feed, respectively. 15. The hydrogen storage system of claim 10 wherein said heat is transferred from a coolant system. 16. The hydrogen storage system of claim 10 wherein said heat is transferred from an electrical heating system. 17. The hydrogen storage system of claim 10 wherein said hydrogen supply feed further comprises a shut-off valve that is operable between an open position and a closed position to regulate said hydrogen flow. 18. The hydrogen storage system of claim 10 further comprising a safety valve that is in fluid communication with said gas phase hydrogen feed, wherein said safety valve is operable to reduce a storage pressure when said storage pressure exceeds a tank threshold.