On older Mercedes diesel engines models: 1975 to 1976 115 chassis 300D, all 123, 126, 201 and 124 chassis diesels from 1977 to 1993 the engine shutoff is controlled by vacuum (not electrical). An engine driven pump supplies vacuum to the system and a vacuum operated shutoff valve shuts fuel off inside the injection pump.
Common Mercedes Problems & Solutions
If you have a problem with your older Mercedes and are trying to figure what is causing it or how to fix it, you have come to the right place.
Let Kent explain how his solutions finder works: "Just select the location of the problem you are experiencing, the chassis designation of your car and a few key words and click Search. If I have written a description of the problem or one related to it, it will show up on the results page. The causes of the problem will be explained and all possible solutions we offer to diagnose and fix it will be listed. Read More
You can learn a lot about your Mercedes by just browsing through all the problem descriptions I have written related to your model. My new solutions finder replaces our old benz aid forum and tech help page. Even if you have never work on your car before it is never too late to start. With the right knowledge, tools and parts you can do it.
If you can not find your problem listed for your chassis then it has not yet been written. I am working on and adding new problem descriptions weekly. I will be adding more content on the W140, W202, W210, and W220 chassis later this year. If you have a problem that has not been addressed, send it to me as a COMMENT through our contact page describing your particular problem. I will not be able to answer these requests directly, but I will add it to my list of problems to work on....the list is not getting smaller. :-)
There is nothing quite like the feeling you get when you can find and fix a mechanical problem yourself,