I have a 1984 Mercedes 300D that runs like a Panzer. It rumbles, but she’s still a gem. Trouble is, she won’t turn off when I pull the key out. I admire her dedication, but it’s really annoying having to open the hood and hit the stop lever every time I park. The electrical system turns off, but the…

The solenoid that operates the fuel shut-off might be bad, or there’s something physically preventing the shut-off from operating. Since you can operate it manually I’m guessing it’s the solenoid.

The shut off is vacuum operated. Like most (all?) MB diesels, the 300D is shut off by the fuel shutoff valve, which is a vacuum actuated device located near the injector pump. The key “ignition switch” is the control valve to port the vacuum to the shutoff valve. The most common “failure” mode is …

A diesel will run as long as fuel runs into the cylinders. The fuel cutoff is failing. Benzman basically is saying find the fuel and stop it.

The locks don’t work either. That’s a great point… I’ll try the MityVac. Thanks for the lead!

1984 Mercedes 300D Turbodiesel Won't Stop

Maintenance/Repairs

GreasyJack October 31, 2009, 2:26am 3

I believe it can just be that the accelerator linkage is out of adjustment. I seem to recall there is some sort of procedure involving special Mercedes-Benz protractors. Otherwise my vote would also be for the solenoid.

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1984 Mercedes 300D Turbodiesel Won't Stop

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