fresh water pump runs but won't prime and push water

ksg5000 wrote:
Another possibility - check the inlet filter. Sometimes that can get plugged up which prevents water flow - mine was filled with plastic shavings likely from the holes Fleetwood drilled into the plastic tank when setting up the FW tank.

And yet another possibility. My camper did not have a filter and the shavings were inside of the pump preventing the valves from closing. I took it apart, cleaned out the plastic shavings and installed a filter to prevent future problems.