Rare fuel tank problem

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It started about 3 months ago when everytime I turn the key to open the fuel cap, I have to pull a little bit. When it opens it makes a sort of suction noise. I didn't think much of it at first. This then got more intense until I started smelling petrol. I then striped the tank to see where it leaked when I saw a very small(needle thin) spray of petrol. I then took it to a mechanic and we took the tank off only to find a tank that have been sucked in to such an extent that it formed dents. On the outline of one of the dents was where the petrol sprayed. I suspect the problem to lie at the fuel tank's pressure outlet or something but am worried that the problem is in the bike self.

Please help.

Thanks!

I didn't find the right solution from the Internet.

References www.motorcycleforums.net/forum/mechanics-corner/42380-rare-fuel-tank-problem.html

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