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Nissan Murano Locked Gas Cap
This morning, I played with my remote key again and finally the cap opens. Just out of curiousity, I left the cap open to see how the mechanism works if I played with the remote key. I found out that it doesn't engage all the time but the best way to do it is to keep pressing the 'open' position untill the lock on the cap disengage.
I did it several times and it worked. I just hope that it will work all the time using this method.
I also sprayed a rust check oil on the mechanism as suggested from a previous post.