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In theory the system should (or might) be set up like this:
A deck fill plate, to put fresh water into the tank
A hose leading down from the deck fill plate, into the tank
A fresh water storage tank, with two more hoses leading out it it.
One small hose, which is a VENT and OVERFILL line, that should run to a small vent fitting in the hull, usually high on the transom. Sometimes the overflow line is just allowed to leak into the bilge, cheap but not good.
One larger hose, which goes to a
Water pressure *PUMP, and sometimes a separate or integral pressure storage tank, and from there to
The Sink, which should drain straight down into the hull, connecting to a THROUGH-HULL or SEACOCK so you can't flood back up through the drain.
*About the water pump, it can be an electrical pump, or a manual pump (hand pump or foot pump) on the sink or below the sink.
So what you really need to do is start with the fill plate, and crawl all the way through the boat (heck, it's only 22 feet!) and trace the run of the hoses. Once you've traced it all out, the rest should become obvious.
The deck fill plate is also optional, on many small craft you are expected to simply take a hose below decks and fill the water tank directly, by lifting a cushion and opening a filler plate.