I won't say you're wrong, but in the photo above (#218 from Colin) I'm convinced the inlet is the inverted triangle shape (or the air cleaner in the diagram) and the output is the hard (copper in the parts listing) line from the pump cylinder head heading toward the outside/left of the truck. Similar on both CMP and MCP that leads to either the through-frame fitting on a CMP or the running board fitting on MCP (see post #209). I don't see a reason to extend an inlet for the pump to the outside of the vehicle but you would certainly want the outlet for connection of a hose for tire inflation to be on the outside. MB-C2 supports the hard line being the outlet as does the structure of the ball check valve below the fitting for the hard line.
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