Water pump pumps water out city water inlet

[JPSCOTT123]

I have a nautilus P4 system in a 2020 Cardinal Limited that I'm de-winterizing. I filled the fresh water tank and heater tank. I put the nautilus into Dry Camping and turned on the pump. The water is being pumped out of the city water inlet. Any ideas?

Never mind. The mini-filter in front of the check valve was installed backwards pushing the check valve inward.

[Bama Rambler]

Glad you got it figured out and as you found out, it's usually the inlet check valve leaking by for one reason or the other.

[Brother Les]

Did you install the screen backwards?