Gravity Fill Problems

[BCxID]

2017 Shadow Cruiser 240BHS

When I attempt to fill my fresh water tank through the gravity fill, water comes back out and the tank will not fill without a hose. I attempted to fill it with a water tank and water would not go down the tube and into the tank. I want to boondocks more and need to figure out how to fill my tank without a hose.

[16ACE27]

Your fill vent could be clogged or your fill hose can be kinked. I don't know if you can put eyes on the hose from under the sink but that's where I'd start onve you verified the vent is clear.