I can't get my fuel door to open. Maybe the lock is frozen, any ideas on how to open it
Rob

From inside the trunk, remove the liner on the side of the fuel door. Now look up along the wall in the area where the fuel pipe enters the car.
The device you seek will have a vacuum line attached to it and with a little effort you may be able to pull back the spring plunger thingy while someone on the outside opens the door.

Your problem could be as simple as a bad actator.(This is the vacuum thingy that moves the little shaft into the locking or unlocking position on your fuel door). Or as difficult as locating the break in the vacuum line that supplies vacuum to the actator. Usually if this is the case, you will have an issue with your central vacuum locking system too.

If your car is a w126, the vacuum pump for this system is in the spare tire well on the lower right side. Not sure of other models though.

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Selling used Mercedes parts on Ebay...always changing...
cdplayer51 take a look!
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Have you ever had it open?
If not you have to press on right side adge
& it will pop open
I was confused the first time I opened mine
Luckily it works like a charm
As it loves gas!

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83 500 SEC Euro 198K

That vacuum pump in the boot - does anyone have the wiring for those 3 pins on the round connector? Mine has just one round connector with 3 wires going into it.

Cheers.
Steve.