Fresh Water Tank Won't Fill

I once found that mud-daubers had plugged my vent and caused the same effect.

You have a vent hose that should be next to the fill spout. Somewhere that hose is kinked, or you have something stored next to it pinching it off. Try blowing back through it when you find the opening, and see if it is open. Some will get water in them when you are filling, and that will block it. I used a piece of IV tubing to pass down the line a ways to blow it out. Just some things to check.

Mike

Look for a vent. On my trailer it is under next to the drain. It also has a valve on it that i discovered by accident for exactly the same reason.

Water tanks have small vent tube which when kicked or clogged will prevent tank from filling - worth a look.