Gas Cap vents

[macojoe]

My boat has a perfect vent, but when the tank is full and I have the trailer up a little on the trailer to keep the water draining, the vent gets blocked by gas, The result is leaking gas out the vent.

I have thought about adding a second vent in the front of the tank so the air will vent there when boat is tilted. But that means drilling a vent hole in front of the tank?
So i was thinking of a vented gas cap, but all the ones I see still needs the small hose connected, which means still drilling a hole for a vent.

I know i can't be the only one with this problem, so what have you guys done??

Thanks