At the fuel station today the fuel cover wouldn't open (not the best time for this to happen...). I eventually managed to get it to go thankfully, after many attempts.
Got home and checked it out. The cause was the latch, which rotates as it moves in and out. Being plastic on plastic it had started sticking, so I just applied some silicon grease to all surfaces and it now works a treat again.
May be worth applying some grease before the problem catches you out too in the fuel queue.
Hope this helps
