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Non-shutdown of a diesel engine of the 115/123/126 vintage is usually always
the mushroom shaped shutoff valve on the back of the injection
pump.
There's a vacuum circuit that goes through the ignition switch and
in the off position it allows full (about 15-20 lbs) vacuum to
the shutoff valve. Inside the shutoff valve there is a diaphragm
and when vacuum is applied it pulls a lever inside the injection
pump that shuts off the supply of fuel to the motor.
Check to to see if the vacuum hose is still attached to the shutoff
valve. If it is, see if it holds vacuum. You can use a vacuum test
gauge or (and it tastes very very bad) you can just suck on the hose
yourself. Prepare to eat oil if things are really ugly in there
you don't want and shouldn't have oil in that line that could
indicate vacuum pump failure and that would need to be addressed
also.
The most common cause of failure in cars of this vintage is a defective
shutoff valve, they're cheap and fairly easy to replace.
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Advocacy
Engine
Nostop
