Question about 1990 Mercedes-Benz 300 Diesel
I have to turn off the engine manually by raising the hood and pushing down the lever marked "STOP" until the engine stops running. The engine rpm's do lower when placing the ignition switch in the off position, but not quite enough to kill the engine. Could this be caused by a faulty vacume line or something like that? The engine starts and runs great, all of the accessories work fine including the alarm system, so I dont want to go and start replacing parts which are fine and having a high repair bill with parts not needed. Any suggestions?
This particular problem is referred to as "Dieseling" actually. Older carbureted vehicles do it quite often. Usually it is caused from the vehicle actually receiving too much fuel and running rich enough to keep the vehicle operating after the ignition is shut off. On a diesel motor, there are actually no spark plugs, the mere compression of the cylinder causes the igniting of the fuel. So my guess would be is that the motor is running rich, for whatever reason. I honestly doubt it is a vacuum leak, however I wouldn't rule out that possibility completely
Posted on Aug 07, 2008
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FUEL PUMP SHUT-OFF SWITCH
This device stops the electric fuel pump from sending fuel to the engine
when your vehicle has had a substantial jolt.
After an accident, if the engine cranks but does not start, this switch
may have been activated.
The fuel pump shut-off switch is
located in the front passenger
footwell area in the right upper
To reset the switch:
1. Turn the ignition to 1 (LOCK).
2. Check the fuel system for leaks.
3. If no leaks are apparent, reset the
switch by pushing in on the reset
4. Turn the ignition to 3 (RUN).
5. Wait a few seconds and return
the key to 1 (LOCK).
6. Make another check for leaks.
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