Clearly you haven't looked everywhere as you haven't found it yet.
One clue: turn on the pump and listen very carefully for where the sound is coming from.
Did you unscrew some panels? Looking at your floorplan I would guess that it is either under the closet in the back, or under the fridge, pantry or kitchen sink.
Looking at some pics of your unit: Remove the vent under the fridge and look in there. Pull some of the drawers out in the back dresser and look under there--especially since the water heater is back there. I'm guessing this is where the pump/tank is in the waay back.
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