Just installed new fuel tank and believe the best solution to a leak free system is 2 things.
1. IMO new tanks are not compatible with old filler pipes and best solution is to replace the filler pipe also. I tried the oversize 0 ring and it was better but some seepage. The new filler pipe was a snug fit and leak free.
2. As previous owners have stated to get a leak free fuel sender you need the cork gasket, copper washers and aviation sealer.
1. IMO new tanks are not compatible with old filler pipes and best solution is to replace the filler pipe also. I tried the oversize 0 ring and it was better but some seepage. The new filler pipe was a snug fit and leak free.
2. As previous owners have stated to get a leak free fuel sender you need the cork gasket, copper washers and aviation sealer.