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My daughter borrowed my wife's 2002 E320. She went jogging and opened the gas cap door, locked the car, then put the keys in the gas cap door and closed it! A locksmith opened the car door for her, but could not open the gas cap door or retreive the keys. Is there a way to do this?

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  • jtsolari Aug 20, 2010

    I am hoping to find a solution that does not require prying the gas cap door with a screwdriver


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If you peel back the inner lining of the trunk, on the gas cap side you can get access to the gas tank cap.
Of course that requires your trunk to be open.
press your finger exactly in the seam on the right-hand side and it will open. Press anywhere but that exact location, and the door won't budge. Make sure all the door locks are open. If they are, then just press the left side of the gas cap and it will pop open. ----------- The gas filler flap opens by pushing in on the front edge of the flap. This will pivot the door open from the rear edge. If this does not work, you should still be able to get it to rock, and see the little pin in the middle of the rear vertical seam between the flap and the fender. Try starting the car and cycling the locks by pulling the button up and down on the driver's door, then, with the car still running, see if the flap will open. If not, the actuator is likely shot --------- You can manually disconnect the lock by moving the plastic liner in the trunk on the passenger side and looking up behind this liner just below the trunk spring. There is a rod that goes to the gas filler flap area, and if you pull this aft you will unlock the flap. You need to check to see if the rod stays in that position (it should, but may not depending what the failure mode was). If the rod wants to go back into the lock position, you will need to hold the rod in the unlock position with one hand (left) and open the flap with the other, or get a little help from another body. In some cases disconnecting and reconnecting negative cable of battery helps to get the gas cap door open.keep the battery terminal disconnected for 30 minutes then reconnect it and recheck/. Thanks. Keep updated for any more query. You can rate this solution and show your appreciation.

Posted on Aug 20, 2010

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I suppose the gas cap door should be where you put fuel to the car (but why would she do that). Well, i think the security of the car has been activated, so you would need to contact a Mercedez Expert to assist you.

Best regards

Posted on Aug 20, 2010

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Sounds like it is jammed. wrap some soft tape around a screwdriver so you do not damage the paint. gently turn the screw driver blade sideways in the space opposite to the hinges till the door moves slightly sideways.then gently to the right or left ... whichever is opposite to the hinge. it should open. failing that you may very well have to pry it open with some force and replace the door later as the car isn't much use if you can't access the fuel filler.

Posted on Aug 20, 2010

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