City water hookup leaks

[jornvango]

While boondocking, I noticed the city water hookup is leaking. We haven't used that hookup in about 5 months.
Could it be a seal in the city water hookup? I'm not sure how that hookup is connected plumbing-wise and what normally stops water from coming out of that hookup while boondocking with the water pump turned on and the system pressurized.

2009 Casita travel trailer

Thank you!

[Community Alumni]

When mine leaked it was some sand or crud that got in the valve on mine there is a stem inside that I push in against the pressure and that flushes the valve out.

But I have also replaced two

JimR

[Rover_Bill]

Backflow preventer valve may need cleaning or repair. See this YouTube video.

[Beverley_Ken]

There is a one way valve just inside the city water hookup, actually it is part of the hose input. Inside the fitting is a one way valve that sometimes becomes dislodged, Most common after winterzing.
The part us not expensive, approx $10. Easy to replace, on the outside of the RV, remove the screws holding the inlet, pull out slightly and replace with the new. New caulking and done.


Ken

[agesilaus]

We we fill ours it drips for 5 or 10 minutes, thru the overflow vent I assume.