Fuel vent problem, help

[Livetosea]

Is it possible that I have a clog in my fuel vent? While filling tank on trailer last week and thinking the tank was only 3/4 full; fuel started spirting out of fuel (location) vent high on port side underneath filling cap. I tried to start filling very slowly afterward to see if the problem was me filling too fast but, same thing happened. I have read here in the forums in the past that some people have had wasps getting into the vent that created that problem. If I want to check to see if that is the problem how do you go about checking or removing the vent at hull side? I don't have access from the inside. If the vent is clogged up with some kind of wasp or whatever, will fuel still come out of the vent?
The next morning I was smelling around my stern hull vent and there was a heavy fuel smell. A little nervous.
Thanks for any input.