You'll need to investigate with a partner to see what the issue is-- or
just take it to the dealer if under 60k for a free fix. You'll need to
check whether the plunger pulls back all the way and whether the door is
somehow hanging up, and whether the opening spring is functioning
There may be come corrosion in the actuator cable. Try working some
lubricant in at the fuel filler end and let gravity assist it in
reaching the lever by the seat. WD-40 is a piss-poor lubricant (it's
primarily kerosene), so I suggest getting something like Tri-Flow or
another thin oil-based lube that lubricates better.
I've had this issue with my 02 Elantra VE and if I pull it a few times it
pops open. It is worse in winter. However, I recently bent the clip on the
door slightly and I've never had a problem. Only if I wash the car and there
is a flash freeze.
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