Odd water leak

[Tim R.]

I have a 1997 Pleasure Way STW. The port on the side of the van has the water fill, a vent and a city water connection. The city water connection is basically the same as the female end of a garden hose(for obvious reasons). It also has a rubber cap that snaps into the fitting. When I pressurize my domestic water I get very slow leak from the city water port(not connected to city water). I was just going to purchase a female threaded plug and keep it in there when not using city water. Anyone ever seen this? Is this the best solution?

Thanks,
Tim

[GallenH]

What do you mean by pressurize the system when not connected to city water? Turning on the pump? I have the same year/model PW as you and I've never had any water leaking from the city water inlet when operating off of pump/fresh water tank. So I don't believe it's a common situation.

[GeorgeRa]

Your plumbing diagram will likely be different but I would think you should have a check valve downwards from the inlet. Check it.

[Tim R.]

Thanks George. Makes sense that there needs to be a check valve to prevent the water pump from pumping out the city water inlet. Now I need to find it!