Date registered: Aug 2005
Vehicle: 1972 250C, Ducati ST
Location: Norfolk, Virginia
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How hard is it to fix/replace the vacuum reservoir?
The vacuum reservoir in my 250C obviously has a leak. The central locking for the doors, trunk lid, and fuel door will only work for about the first minute after I shut the car off. After that, locking the driver's door doesn't lock or unlock anything else.
The owner's manual says that the reservior should hold enough vacuum to be able to activate the central locking system about eight times after the car is turned off. Further, I would suspect that the system is designed to hold a vacuum almost indefinitely with the car off, since it appears that a constant vacuum is required to keep the fuel-door locking pin in the extended (locked) position.
Also, would a leak in the vacuum reservoir cause a leak in engine vacuum, or is there a "one-way" type of isolation valve in the system?
I haven't seen the reservoirs in anyone's parts catalogs online, or seen them on eBay. Is this part still available from Mercedes, and how big of a pain is it to repair/replace?