Can't fill fresh tank over 1/3

[big_murph_279]

I have a 2016 Flagstaff Super Lite 29FBSS. I tried to fill the fresh tank a couple weeks ago and it didn't take much water before it started coming out the fill tube. I shoved the hose in a little further so that it will kind of make a seal I guess. This allowed me to fill the tank. During this the vent/overflow started working and I could hear air coming through it. Today I tried to fill it and the water got to 1/3 and started to overflow out the fill tube. Never could get it filled. I got home and tried to blow through the vent hose. I was able to blow through it. If I blow through the fill tube you can fill the air try to push back at you. If I blow real hard I will get some air out of the vent but I still have back pressure in the fill tube. What should I do to correct this?

[jolooote]

I had a 2001 Georgetown and the manufacturer sprayed sealant/undercoating all underneath. They ALSO sprayed it on the tank vent hose and sealed it shut.

[SCClockDr]

On our unit both the vent and fill tubing ran up from their ports then bellied down forming a trap prior to attaching to the tank. This lead to much reluctance to fill and much belching. I shortened and streamlined their runs and it now fills with ease. No water comes out till it is completely full.

[Chuck_thehammer]

or fill the tank more slowly.. but check the vent hose. bent/kinked/pinched. or restriction.

[Bipeflier]

You may have a kink or sharp bend in the vent tube? It may require taking the covering down to inspect.