Water pressure low

[Janine]

Help. When we first got to this park, the city water was OK. Now, it starts out OK, then quickly goes down to a trickle. We have to turn on the water pump to get a decent amount of pressure. And ideas what might be the problem? Is there an on-board filter that we don't know about? Water flows at about 40 lb when we had the gauge on, so we took it off. We have a 2020 Montana 3813MS