Montana Camper - Are you camping where they have the city water hookup or are you filling up the fresh water tank and having to use the water pump to use the water.
If you are connected to city water then what you are describing fits what my water pump does if I have it turned on and the fresh water tank has no water in it...
Just asking to verify which camping mode you are in... It makes a big difference in using the water pump. We never have our water pump turned on when using the city water connection... The city water pressures up the trailer system without using the pump.
just my thoughts of a possible reason for what is happening
Roy Ken