I'm a newbie - my first post.
The Clio fuel flap problem you are experiencing has just occurred on the wife's 07 Clio mk3. I came across your thread trying to sort it out myself and by some miracle I cracked the problem.
Firstly make sure the car is unlocked.
place your fingers in the rebate usually used to open the flap and apply just enough pressure to open (lift) the flap so that it is no longer flush with the car body. The idea is to slide or pull just the painted flap in a HORIZONTAL direction towards the rear of the car (don't yank it).
It takes quite a bit of pressure to get the flap to separate from the locked hinge section of the flap. There are five clips that hold the painted section of the flap in place and they only release when the painted flap is coaxed backwards and horizontally.
You should now be looking at a black plastic hinged section that is still locked, there are two openings in this black bit. The opening at the top of is where the locking mechanism is situated it is a thin pin that locks and unlocks VERTICALLY - take a pair of long nose pliers and gently move the pin upwards.
Voila! you can now fill up.
The lock can be accessed by removing the four torx screws and the cover attached to the body of the vehicle check the connection but you will probably find the lock is knackered - I'm not going to replace mine but you can get the part and replace it quite easily.
The body coloured cover is easily replaced - do this with the hinged section in the open position and slowly push it into place until you hear or feel it click back into position.
Good luck - hope this works for you.
Answered Aug 8, 2014 (9 years ago)