[Gregs71]

Not sure if you are aware, but that plastic is just a shield to protect from debris. Unbolt those bolts (they only hold the plastic cover on) and take a look at your gas tank (which is secured by large steel straps-which are kinda difficult to remove).
If the fuel is leaking from the bottom of the metal tank you have a hole, if its leaking from somewhere on top of the tank it could be a fuel line, or gasket.

When I removed my plastic shield I could see a small pinhole where the fuel was leaking from-in fact the whole corner of my tank was swiss cheese...