If you go to a vented cap, you don't have to drill another hole. Just move the vent line from the current vent to the cap. done. Then you will have a vent on the side of the boat that doesn't do anything...
thanks zacs, but the issue is the back vent gets blocked by gas when boat is tilted up, so I need a second vent up front so when tilted it vents.
I am waiting for a new cap i ordered on line and see if that is going to help