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1st Gen Ram Tech'93 & older Rams: This section is for TECHNICAL discussions only, that involve 1993 Rams and older. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
In newer vehicles the resevoir is part of the pump. If there's no cap on the pump, then it's a remote resevoir and you'll just have to follow the thick hose up from the pump to wherever they've mounted it.