It won't shut off with the key, or the red lever on top of the engine. Usually the answer is "vacuum leak," but wouldn't the red lever still work?

Is there something else that can keep the red lever from shutting off the engine?

__________________
'75 John Deere 450C (times 2)
'83 240D plus parts car
'87 F350, 6.9L IDI
'89 F350 crewcab, 7.3L IDI
'89 F-Superduty, 7.3L IDI
'91 F-250, 7.3L IDI
'91 F-350, 7.3L IDI
'94 F-350 Crewcab, 7.3L IDI
'94 E-350 Ambulance, 7.3L IDI

If red linkage has excessive slop I guess to would not work. Look closely at the mechanism the lever is attached to and try to manipulate it. Otherwise try a piece of work accross air intake.

__________________
Jim

Agree. I had a problem with the shutoff valve (300SD)and had to replace it. However it was tricky getting the red lever to cut off the engine beforehand. I would guess that it was just not tight enough; took several attempts each time with the lever over a period of a couple of months before I finally replaced the shutoff valve on my 1981 300SD.

Have not had to use the lever since. Not sure about a 240D but you might have a bad shutoff valve at the back of the injection pump.

Back story is this is my daily driver, been working great for a couple of years now. I did an oil change, started the engine after, and no stop. I'll tee in a vacuum Gage this afternoon to rule out problems there.

Sounds as if I need to take most of the slop out of the throttle linkage that runs down to the pump?

Is the linkage to the shutoff internal to the pump? Guess it can't be, since there has to be a vacuum actuator down there somewhere.

__________________
'75 John Deere 450C (times 2)
'83 240D plus parts car
'87 F350, 6.9L IDI
'89 F350 crewcab, 7.3L IDI
'89 F-Superduty, 7.3L IDI
'91 F-250, 7.3L IDI
'91 F-350, 7.3L IDI
'94 F-350 Crewcab, 7.3L IDI
'94 E-350 Ambulance, 7.3L IDI

Probably dislodged one of the vac lines.

__________________
Jim

Try applying vacuum directly to the shutoff with a MityVac to test the diaphragm. Shutting it down with the red lever can be tricky.

__________________
"Rudeness is a weak man's imitation of strength" - Eric Hoffer

http://www.peachparts.com/shopforum/attachments/diesel-discussion/79848d1271647942-79-300sd-fuel-cut-off-solenoid-picture767b.jpg


Location of shutoff valve. 300SD

Found it! Yes, it was a vacuum line. That's a great picture, tyl604.
The orange-y line with the blue strip had gotten knocked off, and since I don't really know what it's supposed to look like, I didn't notice.

The shutoff vacuum solenoid is below that white thing, to the left of it in the photo. Applying a vacuum to that white thing does NOT shut off the engine, unsurpisingly.

What is that white vacuum thing on the top back of the injection pump?

Also, a gratuitous picture of my shut off valve.

Down low, on the back of the pump, below and obscured by the white thing with the green vacuum thingy plugged into it.

__________________
'75 John Deere 450C (times 2)
'83 240D plus parts car
'87 F350, 6.9L IDI
'89 F350 crewcab, 7.3L IDI
'89 F-Superduty, 7.3L IDI
'91 F-250, 7.3L IDI
'91 F-350, 7.3L IDI
'94 F-350 Crewcab, 7.3L IDI
'94 E-350 Ambulance, 7.3L IDI

While I do not see a dome on it like mine, that white plastic gizmo looks like your Vacuum Control Valve (VCV) - regulates vac going to the tranny. Keeps it at 15PSI as I remember and bleeds it down as you accelerate.

Has been since 2011 when last I looked at it, but that is what I remember.

Someone please correct me if I am wrong.

X2. Vacuum Control Valve (VCV) emulates the vacuum throttle response of a gasser = input signal for the automatic transmission.
(Vacuum increases with acceleration)

__________________
78 W116 300SD 'Desert Rose' new as of 01/26/2014
79 W116 300SD 'Stormcloud' RIP 04/11/2022

Glad to read that you found the dislodged vacuum line. Gotta love easy fixes. But you have another task to put on the list. If or when that vacuum shut off gets a failed diaphragm, you will need that red lever. If you get another leak in the vacuum system, the vacuum shut off may not get enough vacuum to do its job. You will need that red lever. While everything is working, now is the time to figure out the mis-adjustment or slop in the ball and socket linkage.

Yeah, good point about adjusting the stop lever. Better get on to that this weekend.

Odd that this would have a vacuum control valve, it has a manual transmission.
Edited to add, it did limit the vacuum I could pull on it to 15psi at idle.

__________________
'75 John Deere 450C (times 2)
'83 240D plus parts car
'87 F350, 6.9L IDI
'89 F350 crewcab, 7.3L IDI
'89 F-Superduty, 7.3L IDI
'91 F-250, 7.3L IDI
'91 F-350, 7.3L IDI
'94 F-350 Crewcab, 7.3L IDI
'94 E-350 Ambulance, 7.3L IDI

Had no idea you had a stick. Yes, someone needs to explain that to me. The purpose of the VCV in an automatic transmission is to make it shift smoothly. I know not of anything else it does.

So what does it do for a stick???

Really interested. Someone, please.

I did get that stop lever adjusted. I just had to shorten the linkage rod running down from the lever to low on the engine side of the injection pump.

__________________
'75 John Deere 450C (times 2)
'83 240D plus parts car
'87 F350, 6.9L IDI
'89 F350 crewcab, 7.3L IDI
'89 F-Superduty, 7.3L IDI
'91 F-250, 7.3L IDI
'91 F-350, 7.3L IDI
'94 F-350 Crewcab, 7.3L IDI
'94 E-350 Ambulance, 7.3L IDI