Fuel Tank Help

I need some advice. After refueling the last trip, I had a really heavy gasoline odor from the bilge - actually coming out of the anchor locker on the bow. I traced it to this aft access port. Fuel was "oozing" from under the rubber gasket you see in the pictures. This is the fuel pickup port - the fuel fill and overflow are on the other end of the tank and they look fine. I pushed down and fuel came out under the gasket. So - I removed it. As you can see, the screws mounting the fuel pickup are three different sizes. The fuel has taken the paint off the tank.



Here is where I need advice: I rethread those holes and replace all the bolts - no problem. Question is do I need some type of gasket sealant, or will the rubber gasket suffice with good bolts? One bolt was completely stripped and I believe the gas was coming from that side of the gasket. Any thoughts?