83 300 turbodiesel, during a brake job at a shop, something went wrong
strange, I can't stop the engine from running.
0. turn off the ignition
1. took the battry terminals out
2. took the glow plug connector out

finally, took a pair of vise grip and pinch the fuel line, and starve it, then it died.

never had this experience before, any idea?

greatly appreciated.

You have a vacuum leak. The shutoff is vacuum operated. To shut it down next time, just push on the throttle linkage towards the engine. Most engines have a stop sticker there.
Fairly common. If you search around enough you will probably find a vacuum line detached.

Ya, way easy to just use the throttle linkage kill button. Follow that IP shutoff valve vacuum line and see if you can find a leak. If you put vacuum on that line and the engine continues to run, you have a dead shutoff valve. Though my experience of that is a long, slow death with warning...

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Think Alternative Energy!
300CD '80 (now gone but not forgotten...)

the vacuum line for the shutoff has a brown stripe

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1981 300SD 512k OM603

yes, the mechanic disconnected all of the vacum houses by the brake master cylinder when he was replacing it, and forgot to connect them.

anyways, thanks for the quick response,
one last qestion, so the pump I have in the trunk is the vacuum pump, right?
why does it stay on all the time, is there a fuse or a relay not working?
is there a repair manual on the forum I can download?

The '83 300D did not have a vacuum pump in the trunk. I'm not sure what you have there that runs all of the time.

You can buy a CD-ROM version of the factory service manual (FSM) from Mercedes for about $20. See this link click on "Classic Center" and select "Technical Literature." The part number is QL-6550-1460-02.

Jeremy

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970

Do you have an SD (126)? If so, the vacuum pump in the trunk is for your door lock system. Completely separate from everything else. It should not stay on.

Diesel engines can only be shut off by starving it of fuel, or air.

You have found a mechanic to stay away from.

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83 SD

84 CD

As MBZ said, starving fuel or air is the only way to kill a diesel (excepting the modern computerized ones). The battery, glows, & ignition switch do nothing once you are past the starting up phase. (This is good knowledge to remember in case of a runaway). The only reason the key kills it is the vac switch in the back of the ignition switch for the shutoff valve.
I really do have to ask...WHY on gods green earth did this guy have to pull all the vac lines to do a brake job?

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Chris
64 190D R.I.P.
80 240D W/617 engine -for sale
82 240D -for sale

this mechanic guy is so stupid, I found out that the leak is at the booster pump, just where he changed the brake master cylinder, so now, I dont know what is in there, or what he has cut off, or what?

any idea?

Where is the leak in the big main vacuum line that goes from the booster to the vac pump on the front of the engine.Or is the leak in one of the smaller feed lines that come off the main one.

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• 1989 Jeep cherokee 4x4 110k (sold)
• 1988 Porsche 924S 90k totaled
• 1988 VW Sirocco 16v 110k? (needs work)
• 1985 Volvo 745 Turbo 225k
• 1981 Mercedes 300D "Olga" 205k 100k on Mercedes factory reman motor

Did you happen to see a label on the linkage atop the engine with the word "stop"? Press this next time.

Look at the injection pump. Thats the thing with all the lines coming out of it on the drivers side of the engine. There's a brown ( if I remember correctly) vacuum line coming off the back of that IP. When it gets sucked on (vacuum) the engine stops.

Use the search option here and read everything you can find about the vacuum lines... then you'll have her fixed in no time.

Good luck!