Sender unit leak

[Dave]

Afternoon All, 

I’m looking for advice. 
the sender unit has sprung a leak. 
it’s got a brand new seal on it, had to replaced the old one after 90% disintegrated, plus a load of some sort of sealant had been used. 
yet it’s still pissing fuel. 
any ideas ? What are others using? 
is there an easy fir replacement option? 
any help greatly appreciated.

cheers

dave. 

Edited March 22 by Dave
Spelling errors

[nelmo]

A seal will only work well if both mating surfaces are flat and smooth - I'm guessing yours aren't? Probably why there is sealant there from before? Not sure if you can get petrol resistant sealant but that seems to be the way forward?

[Jez Morton]

The problem I found is the metal is too thin and bends away between the studs. I had to add a reinforcing ring inside the tank to stop this.