Did you check it first!? I didnt, and it leaked through the top of the sender not the seal. But i took the tank out through the firewall, so its all gotta come out again Grrrrrrr!
i took it for a drive to make sure the gauge worked didn't think about leaks although it was dry before i welded it back up
I hope mines just a dodgy 1 off, it only leaked because i filled it to the brim of the filler neck, the dished bit with the terminals in was full of petrol! i cant be bothered to strip it all out again yet so now i just dont fill it all the way up :