We have a '15 and no gravity fill. I'm thinking that using the "winterizing" connection with the pump has the water flowing in the lines to each of the faucets, shower, toilet, etc and not into the freshwater holding tank but I haven't tried this. We try to get full service or at least close to a water tap so I can run a long garden hose to fill up the fresh water holding tank. Pressure from the tap should be sufficient to fill up the tank.
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Bruce & Lori & Charli our 60# lap dog
2017 F350 Lariat, 6.7L, 6 1/2' box, Reece 18k Elite
2015 Mountaineer 331RLT, Dual pane windows, Dual A/C, Fireplace, 5th Airborne Sidewinder, Sailun tires.
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