I am working on my 1985 300D to find a vacuum leak. I have isolated it to the central door locking system. For now I put a golf tee in the hose which comes off the first vacuum check valve which splits off for the reservoir and the central locking system. With the tee in place where the plain yellow line fit in, my engine now shuts off right away. Before, I could not get it to shut off even with the emergency shut off lever under the hood. (This was embarrassing at times. One day I thought, the heck with it, I'll just lock the car and let it run. It was then that I discovered that when I locked the driver door, the engine shut off. How convenient. Quirky but convenient.)

I had the panel off the driver side door and all of the hoses looked fine. I also inspected the trunk actuator and that looked ok too. I found the attached diagram and it states that the 3-way and 4-way fittings under the front carpets could be the culprits. This will probably be my next move as they seem to be easier to access than the line to the fuel door.

Does it seem like I am on the right track?

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