If you don't have a mnaual for your boat, I'm sure there's one on the internet for you, maybe right on this website.
If you want to find it, locate your galley sink faucet and follow the hoses (or pipes) between the faucet and the water tank(s). Most boats of your size have at least two water tanks, as well as a manifold with shutoff valves to select one tank or the other. You could start there, too.
Most leaks like this are from loose hose connections. Or a blockage in the water hoses, or an old hose that has a break somewhere. I replaced all my hoses last year (1986), and the pump is just fine.
All fresh water pumps are pretty much the same, so find one on the internet, they have troubleshooting guides in all the manuals.
Good luck.