When I hook up my water hose to the City Water inlet on my camper, I get no flow from either the kitchen sink or external shower, nor do I hear any air coming out. I have checked the filter screen and it's is clear. The check valve inside, appears not to be stuck. When I observe the inlet hose from the inside of the camper, I do not see any water flow. Do I need to replace the Inlet connector? Any and all comments welcome.