Sealing up fuel pump mount???

[67 455 Bird ragtop]

Ok I'm having a fuel cell made for me. Will be using an internal fuel pump. I have a mount setup I purchased from Tanks Inc that has an outlet, vent, and a return built in. I don't want to use them because they are small. I will use a -10 return and a -6 vent in the top of the fuel cell. After I trim the tubes used for the vent and return what would be the best thing to seal the tubes with?? Epoxy or maybe JB Weld packed into the tubes ???

[Mateospeed]

how about bulkhead AN fittings with a close-tolerance hole and o-rings for sealing? Or, weld an AN union or bulkhead fitting onto the tank, and run a hardline from that to your pump. Alternatively, you could make a small plate with welded fittings, and bolt it to the tank with a gasketed surface, using a fuel-resistant gasket material (viton?).

[SparkyRnD]

maybe have the fittings welded or brazed shut (depending on material)?