Date registered: Apr 2004
Location: Edmonton, Alberta & San Tan Valley, Arizona
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RE: 500 SEL Gas fill cap-dumb question
There isn't one.
The lock to the gas flap is controlled by the central locking system.
If the driver's door is locked, so is the rest of the car doors, the trunk and the gas flap. The opposite is true if the driver's door is unlocked.
That is unless the central locking system is not working properly and it's locked shut. The gas flap seems to be isolated and malfunctioning on the earlier models. Kind of like the cruise control - tempermental. My 300SD the rest of the car would lock except for the gas flap.