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Hi, I'm Robert. Welcome to JustAnswer. I'm reviewing your question now and will post back with your reply momentarily.
Sorry for the delay...
IF all your valves are in the proper position you should have water flow into the RV, if you have a water filter I would replace that as if it was plugged it would be an issue. The connector where you hook up normally will have a built in regulator and check valve as well so it is very possible the actual intake connector is at fault, if the check valve failed then it might not want to take water onboard.
If you have more questions or concerns please feel free to contact me.
If you are satisfied with my efforts please feel free to select a STAR rating on the page..... Robert