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A few weeks ago I noticed that the gas door would open. So I locked and unlocked my doors a couple of times and finally the pin went in so that the door open. It happend again last night but it would open. It seems as if the pin is not being sucked in, what is the problem.
thnks.
 

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Sounds like you have a vacuum problem at the gas door. If you remove the liner inside the trunk you can find the vacuum part that moves the pin in and out. It may be that the line has come loose or the part itself my have gone bad. On a 300E I had a similar problem and it turned out the rod/pin has a spring on it that was no longer being held in place.
 
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