This is a new problem for me. When I leave my boat overnight the water pressure in the freshwater system drops to nothing. When I turn on the water pump it clearly sounds like it is running dry. I have to open up a faucet and let it run for 30 seconds or so then the pump will pick up some water and pressurize the system. I can't see or find any leaks. I'm thinking perhaps there is an internal check valve in the pump that's leaking back into the tanks or something else????
Any ideas?
Any ideas?