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The water connection is typically on the driver's side outside wall. You most likely have a valve that switches between "Fill" (a ~60 gal. water tank) and "City pressure" that allows the water pump to be turned off. If the water fill isn't visible on the sidewall, check in the wet bay for the connection.
It sounds like a couple things. First, ensure the bypass valves are closed. There should be two near the city connection that drains water from the general water lines to your camper. The other will be to drain the fresh water storage tank. If the pump is running and the drain valves are closed, the water should be directed into the camper faucets and toilet.
If I'm reading your question right, you're talking about the check valve at the city water inlet. Without that valve your onboard water pump just sucks air, no water. Easy fix. Just buy a garden hose shut-off. The little one with a ball valve. Install it on the city inlet in the closed position, solved. When you at a location with city water, connect you hose and put the valve in the open position.
Many RVs have the plumbing to fill the fresh water tank from the city water hook up. This valve is usually near the city water hook up and labeling is similar to "city water" and "tank fill". Another anomaly from leaving the valve in the "tank fill" position is that, when not connected to city water, the on board pump may run continuously and the water volume is very low.
Probable cause would be a leaking check valve in the pump.
On the RV the city water and discharge from the fresh water pump are tied together. When on city water the discharge of the pump will have city water pressure on it. If the internal check valve on the pump is leaking, water will flow through the pump backwards and into your fresh water tank.
The check valve should not be removed from the housing. You would have to remove the actual entire city water connection to gain access to the water line connection behind the water fill. The check valve must be there to prevent water from being pumped out of the fresh water tank should you be utilizing the demand pump. Before you go through all of that hassle. Remove the aerator from the kitchen sink and turn on the faucet to check the water flow. I have seen the aerators clog up and stop all water flow. When you remove the aerator disassemble and you will notice a small white disc with a tiny hole in the center. Pop this disc out and discard. Reassemble the aerator and reinstall. Also, if you are using a pressure regulator by pass it to see if water flow is restored. Those can fail as well.
Are all the relevant taps turned on?
Is there water coming out of the city water ?
Are all the taps "along the way" open?
If hose stiffens up when you open the "city" side tap, then clearly there is water pressure and the tap on your side must be closed
Best of luck
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