For quite some time I've had fuel leaking from the area where the fuel pump fits into the tank but only when the tank was full. Fortunately (?) tha tank doesn't stay full for long with the V8 :(
I've always assumed it was the pump seal. The reason for that thinking was with the aftermarket Brown Davis tank, one has to cut the genuine rubber seal down to fit the tank opening. Don't ask me why BD didn't make it the same as the original tank.
So I had made up a special tool to tighten the sealing ring (different to the OEM part) but it didn't help.
Today I finally found the problem. The plastic top of the pump has a crack around the electrical plug and it's just enough to weep fuel. Well, more than weep - enough such that the well around the pump is flooded with petrol.
This is where it is cracked:
https://www.aulro.com/afvb/images/im...012/02/135.jpg
Moral of the story? Don't buy aftermarket fuel pumps.