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There is a check valve at the hose connection (much like rynosback describes) to keep water pressure inside the coach when not using city water (if you take out the screen you can see the end of the check valve--even press on it when the system isn't pressurized).
Does your Four Winds have a "water bay" with a valve/switch that you have to change when on city water vs internal? (Most of the Thor motorhomes don't have this: just hookup and it works but you never know.)
Do you fill the hose before connecting up? (Running the water through the hose before connecting to the city water connection eliminates all the spitting and air in the system. In addition, it helps purge the hose of anything before connected to the system.)
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