Then yeah maybe your Water Tank was not in the same Chunk so it might have run out.
Railcraft has Chunk Loaders, so does FTB Utils, maybe you should look into if your Server has that. 
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Then yeah maybe your Water Tank was not in the same Chunk so it might have run out.
Railcraft has Chunk Loaders, so does FTB Utils, maybe you should look into if your Server has that.