Yes the vent, nothing like a trail og gas falling out of the boat all the way to the ramp!! At $4 a gal!!
Its a easy fix, I and a few here have done it.
You have to change the location of the vent, the rule of thumb is to have the vent lower then the fill so it will leak out there before you over fill it.
Well thats the same height as the tanks, so you have to go above.
In the pic you will see the old vent and then the new one up higher next to the can. This leaks zero gas.
You need a 90* elbow vent, one for each side of the boat. and a longer hose.
I left the old vents there as I did not want to have to fill the holes and match the gel coat color and stuff like that.
So just drill the new hole install the new vent and add new hose.
Also if it has not been done yet this would be a good time to replace all the gas lines as the old ones are not for this new gas and if the old hoses are still working they are surly getting rotted from the inside out.