More fuelling issues :(

[Dave McB]

After having the fuel lines checked, the tank checked & the fuel pump checked by a very knowledgeable mechanic, the initial problem with my car cutting out at the 3/4 tank mark is still there.
Unfortunately it now Also appears to have a petrol leak dripping down behind the o/s/r wheel. I assume this is the side that the main pump is on?

Does anyone know if it would be an incorrectly seated pump, or if there is any fuel lines around the o/s/r outer area of the tank or whether it would be most likely the tank would be split or damaged somewhere?