Re: Scenic - has my petrol tank warped?
(what a stupid design if it warps like that).
Well not entirely as they are designed to cope with internal pressure whilst sealed.
Any plastic tank will do it,it's not a problem exclusive to Renaults.
You will struggle to 'force' it back in to shape,once the plastic goes out of shape then it's a real job to get it back to it's original form.
IIRC I have read some where that when working on plastic fuel tanks you have a limited amount of time to carry out work on them before they start to distort if they are not re-sealed.