Are you talking about the city connection on the driver's side? Or the tank fill on the passenger side?
If you're talking about the city one on the driver's side: You cannot fill the tank from there (unless you have a problem with your pump). The city connection simply provides pressurized water to the system so you don't have to use your tank.
If you are having problems with the filler on the passenger side: I would check the vent line for blockages or kinks (its easy to take the passenger bed "top" off to view the tank, pump and associated plumbing).
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