Hello and Welcome to justanswer...
One place where fuel springs a leak on these is on the seal - that fits between the tank and the pump / sender unit..
I will give you a drawing - exploded view of the system to help you - In the pic - item "N" is the seal.
Sometimes though, its the pipe that corrode on the top of the pump unit - look at the diagram .. you will see the two bent pipes - your rubber fuel pipes connect to those - then run to the engine. These pipes here are metal and can corrode as above and leak.. if thats the case, the whole pump needs to be renewed as you cant buy parts separately.
So basically with this issue it needs to be physically / visually and carefully inspected to determine if its the seal - or the pipes as above ..or even the tank that has corroded. Too - you can get leaks on the seals or on the filler tubing --but again - it needs a proper visual inspection to trace the fault...and then deal with it as found. The pic I mentioned - I have uploaded it for you HERE
Im very pleased to have helped you -
If you do need / wish to get back to me, feel free - To do that just use the reply button and I will get back to you as soon as I can..
Meanwhile, please click the Accept button for me now - Thank You.
Rgds - MIKE.