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Memory Alpha

A deuterium pump was a mechanism utilized on board starships for the purpose of facilitating the physical movement of deuterium towards the ship's deuterium injectors for injection into the warp core.

In 2152, after being disabled by a mysterious vessel, Enterprise NX-01's chief engineer, Commander Charles Tucker III, began efforts to re-initialize the ship's warp engines, a process which included priming the deuterium pumps. (ENT: "The Crossing")

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