Hi Mary ann,
You mentioned that before you connected to city water, you had pump pressure inside the coach? Have you checked to see if you are getting water out of your city water hose before it connects to the coach? If there is, check to see if there is water pressure where your reel output connects to the output at your water pump plumbimg. (I believe you have access back behind the water bay thru the compartment just forward of it) I have also seen the brass pressure regulator come apart internally and block the water flow. If you're inclined, keep taking stuff apart until you find the restriction.
Regards, Fred