Dan_Diego
Jul 01, 2020Explorer
Water pressure - why does pump run when city water connected
I mostly dry dock and have only recently began to camp where water and electrical hook-ups are available. When connected to city water, I have a 40psi regulator in between the city hose bib and the trailer's city water connection. I have not mapped my water system but have looked at general rv water distribution diagrams. It appears that fresh water tank is on inlet side of the pump while the city water connection joins the water system on the outlet side of the water pump. I do not understand why the water pump runs when under city water pressure. I would guess the pump runs as a result of the loss of pressure on the outlet side when a faucet runs (loss of the 40psi). Is the running pump then trying pump what ever remains in the fresh water tank until it is empty...and if so, is it damaging for the pump to run once the fresh water tank is completely empty?