Low water pressure

[Mroe]

We have a Montana 3120RL and this is the second campground we’ve been at where our water pressure is low when connected to the city port. When I turn my pump on it doesn’t turn on. When I turn the water off and turn the pump on to use tank water, my pressure isn’t much better. I don’t have a filter and my screen is clean, anyone know what else I can check, maybe a partial stuck check valve ( where ever it is)