I was in the garage today working on the brakes and I thought I'd just check if my ignition key/ fuel cap key inserts all the way into the lock and I can report it does not go in all the way.Now as for this fuel door...is the ignition key supposed to go all the way into it or just part way? I ask because the key definitely does not seem to want to go fully in as it does with the ignition. So far I've been continuing to soak the key hole down as I'm doing other work and gently testing it but no success yet.
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It seems to just go in as far as the cut section of the key blade. You will also need to push down hard on the front edge of the flue cap to help the key to turn.
I hope this will help you to get the cap open!!