Fuel tank leak. Help required!

Hi guys. I have a 2010 90 defender which has fuel leaking out of the top of the tank when full. I need to lower the fuel tank to investigate. Can someone please advise how to do this!

Don't know how to drop it, hope it's easier than I found it to be on a 15 year old td5 90. Might just be a breather hose leaking?

If it is anything like the td5 tank, you might be better off doing some careful measuring and cutting an inspection flap in the rear of the floor, you can then get great access without most of the palarvour! Then just sealant and rivets to replace! Easier for next time when the pump goes!!