Hmmm... mine will turn clockwise, but only turns on the alarm. It doesn't lock the door. I can unlock it from driver, passenger, and trunk, but I can only lock it from passenger and trunk. My fuel filler door never locks.

I figure the fuel filler door is probably the last link in the vacuum chain, so there's probably a leak there, but I have no idea what the driver's door problem is.

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Mike Heath
1988 560SL Black/Palomino
1988 300SEL Black Pearl/Burgandy
1984 500SEC Anthracite Grey/Palomino