X17Z water pump question

[difejo]

I frequently camp in state campgrounds without hookups. I have a 6 gallon water jug that I use to fill the fresh water tank. In order to do this I have to lift the water jug
and pour it into the fresh water fill.

I notice in the Jayco owners manual that is says you can connect a hose from the city water fill and place the other end of the hose into the water container, turn on the water pump and the water will be pumped into the RV. Did I read this right? And if the system works this way, does the water pump move the water from my jug into the holding tank, or does my 6 gallon jug become the "holding tank"?

Thanks

[TCNashville]

My manual says the same thing although I've never tried it. In thinking about it, the pump has an inlet [from the fresh tank] and an outlet [to the trailer interior]. If the pump could "fill' the fresh tank from the city water inlet, seems like it would have to pump backwards through itself.

[Grumpy]

The owner's manuals are sometimes generic. The units with the utility manifold system that would be how it would work. I'm surprised the wording doesn't include "if so equipped".