[ReelMagic]

I have a 2003 38 Open and it has 2 fresh water pumps that I used when NOT connected to dockside water.. The reason for 2 pumps is to minimize pulsing when using galley sink, and/or head sink and/or shower. I'm assuming both of your pumps are part of the fresh water system and NOT the salt water wash down pump as that is located in a different place from the 2 fesh water pumps on my boat... I also have a fresh water wash down and that uses water from the tank or dockside supply...I leave the pumps ON whenever I'm NOT connected to dockside water and the fresh water tank doesn't empty as you described...When connected to dockside water I turn both fresh water pumps OFF....One question; if you have the fresh water pumps ON and all sink faucets OFF does the pump cycle on & off periodically. If it cycles on/off I believe you have a leak somewhere... M2C