fresh water tank possible vent blockage

In my C.C., the fresh water vent is a clear plastic hose which plugs into a small plastic screen very near the water hose connection. My fresh water tank also has some sort of floating, leftoevr from buidling material, in it that causes it to block while filling. While filling the tank, I monitor the air flow from the vent. When it plugs, I need to unhook the vent hose, stick my head in the basement door and blow back into the tank to clear the blockage. This may need to be done several times while filling. Truly a P.I.T.A. but I want to make sure my tank is full before heading to my campsite.

Good luck finding your vent. I know before realizing this was an issue I would fill until the water flowed from the fill opening but always ended up with less than a full tank.