1998 hunter 42, fresh water pump came on by itself, all faucets were off, water tank full, and no water to faucets when turned on pump just kept running. Do you think it's the pump or the tank?
Okay thankyouPump may be airlocked? Or start looking for the leak...
Every single domestic water pump manual has very good troubleshooting information included. Download ANY of them, even for a different vendor, and read it.
If you put bleach in the tanks to kill bugs I bet you have a few calcium crystals on the pump's internal valves. easy to fix, just pull the pump head, disassemble (noting direction and orientation of the rubber valve parts), clean in vinegar and reassemble
When I first moved aboard my 40.5, I was having a similar problem. Turned out it was Operator Error. I didn't shut off the empty tanks(s) on the manifold; was sucking air. However, I also had a pressure switch fail on the pump causing constant running. Good luck!