No gravity fill.

My 2014 Landmark does not have a gravity fill inlet for the fresh water tank. Can't use my reverse osmosis to fill the tank. Can you use the city fill inlet to fill the tank by gravity if the lever is switched to "Tank"?

I believe it takes some water pressure to operate the check valve in the inlet. If filling from an external tank, you may need a small pump.

I bought a cheap 12v water pump at Harbor Freight just for this reason. Works great, but you need a short hose to pull from.