I believe that you run a hose/tube from the fresh water intake to the jug/tank with water. You also run the water pump simultaneously. Here is what it says in my manual:
You can gravity fill the fresh water system if you do not have access to city water; however, allow extra time to fill the fresh water system if you are using this method.
Follow the steps listed above; however, at step 3 put the other end of the non-toxic drinking water hose into your container of fresh water, and turn ON the water pump (instead of turning ON the water at the water source.) When the fresh water tank is full, shut OFF the water pump and disconnect the non-toxic drinking water hose.
Here is the "step 3" referred to above:
To use the city water fill
1. If needed, sanitize the water system.
2. Remove the connection cap and attach a non-toxic drinking water hose to the inlet.
3. Turn ON the water at the water source. Enter the RV and open the cold water supply faucets to bleed air from the water lines. When the water lines are nearly full, you may experience some "air pockets." Allow them to escape before closing the cold water supply faucets.
4. The water heater will fill first, followed by the supply lines and faucets.
The fresh water connection should be unplugged (i.e., the non-toxic drinking water hose disconnected) when the RV is left unattended for any amount of time. If something would happen to the water system, this may help limit water damage to a smaller area.
To disconnect the city water fill
5. Shut OFF the water at the water source.
6. Disconnect the non-toxic drinking water hose and reinstall the connection cap.
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