What Dan said, and then I'll bet the real problem is an air leak somewhere in 
the tubing or in the actuator for the lock for the fuel door
Max Dillon
Charleston SC

Sep 21, 2020 8:51:30 AM Dan Penoff via Mercedes <mercedes@okiebenz.com>:

> Patrick,
> 
> First of all, you need to address your messages to “mercedes@okiebenz.com” to 
> get to the list.
> 
> Second, the fuel door can be unlocked manually by pulling the trunk liner 
> down or out of the way just below the trunk hinge area. At that point you’ll 
> be able to see the vacuum actuator fo the fuel door. There will be a red 
> “mushroom” shaped knob on it. Gently pull that towards the back of the car 
> (if I recall that’s the correct direction) and it will release the fuel door.
> 
> I would add that this is covered in the owner’s manual as well, if you have 
> one.
> 
> Dan
> 
>> On Sep 21, 2020, at 8:38 AM, Patrick Atuonah via Mercedes 
>> <mercedes@okiebenz.com> wrote:
>> 
>> ---------- Forwarded message ---------
>> From:<obioz...@gmail.com>
>> Date: Tue, Sep 15, 2020, 2:56 PM
>> Subject: Vacuum pump door lock 1991 350SDL
>> To: <mercedes-requ...@okiebenz.com>
>> 
>> Help!!!  I am looking for a vacuum pump. The one housed in the trunk.
>> This model have two vacuum ports and three electrical connector pins.
>> I can lock and unlock doors but fuel filler door is stuck. How do I open it
>> manually?
>> Anybody have a good spare for sale?
>> PM me if you have a spare.
>> Thank you
>> Patrick
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