The car in question is a 300D 1985 turbo. The engine takes a long time to shut off after I turn the key to the off position. An educated guess on what is happen is there is a vacuum problem with the I/P shutoff component. I can feel and hear a slight pulsing when idling. I traced the sound/pulsing/vibration back to the I/P. It could be my imagination but I feel that the I/P could be in need of vacuum or has vacuum to give. It may have something to do with the problem, or maybe I am just searching. Through diagnostic of the problem multiple vacuum lines have been found that are disconnected, and I have no idea where they are supposed to go. I have looked at multiple vacuum line diagrams on threads of this forum, but could not find the lines that are disconnected on them. So I will describe what I know. I have traced a black tube that is disconnected on the interior side of firewall back to the I/P. Another larger black tube the is disconnected on the interior side of the firewall then goes into the engine compartment and splits off into two smaller tube. Those tube then go to to unidentified components on the drivers side front fender. The last tube is a green tube with a yellow line that is disconnect just above the oil filter housing. I was able to trace this tube back through the firewall into the interior then above the steering column where I where I loose sight of it. I have several pictures laying out the where the lines go in and out of and would be happy if anyone could give me a clue on what is what. I am looking for advice to help find homes for these hoses. Further, Before I start digging in to the area above the steering column and below the cluster I need a few helpful hints on where these hoses go. I would greatly appreciate any suggestions they anybody might have.
Thank You,
Justin

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Your text is too small.

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1985 500SL Euro w/ AMG bits 130k
1984 300SD Turbodiesel 192k
1980 240D Stick China 188k
2001 CLK55 AMG 101k
2007 S600 Biturbo 149k Overheated Project, IT'S ALIVE!!!

The green line is for the climate control. The smaller black line is a vent to the cabin. I imagine you have a leak in the system somewhere and the PO decided to start disconnecting lines to get the engine to shut off with the key.
Not sure what those components on the fender are.

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83 SD

84 CD

I am assuming you have no other vacuum related prblems like poor power braking.

Besides the actual Vacuum Shutoff Valve on the IP itself there is a Shutoff Valve that sits on top of the Steering Wheel Locking Housing under the Dashboard (cost about $25 + shipping) and the tubing/hoses that go to it that can leak.

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84 300D, 82 Volvo 244Gl Diesel

A leak anywhere in the system will cause slow shut off. I'd first check into that green line and either reconnect it or plug off the line to which it should be connected.
You can test the shut off valve on the back of the IP by putting a piece of vacuum hose in place of the brown vacuum line and sucking on it with the engine running. It should shut off with 2 or 3 good sucks. If it does, your vacuum leak is elsewhere. If it does not shut off, the shut off diaphragm is bad and you'll need to replace the shut off valve.

Some of the best diagnosticians on here are old farts. If you want to get answers from them as well as from smart ass kids, make your font bigger.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

For the Old Farts (including myself), "CTRL +" will make text bigger and "CTRL -" smaller. In the meantime, I'll bet Manzone has a Macquintosh(R). They tend to do strange things with text size when viewed on a PC.

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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 a search for "shut off valve."

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85 300CD Signal Red/Tan sold
83 300D Manganese Brown 109K
97 E420 Midnight Blue 197K sold
98 BMW 328i Vert White 100K, sold
95 BMW 525i White 125K, sold
93 BMW 525iT Red 193K, sold
95 E320 Green Wagon 125K, sold
94 E320 White 127K, sold
85 300SD 156K Grey (Annie), sold
84 300D Lapis Blue 170K (Judy), sold
99 ML 320 Black (lease), 1998 C230 White (lease)
00 Honda S2000 Red (lease)
86 Mercedes 300E (sold)
84 Porsche 911 Red (sold), 1965 Porsche 911 White (sold)

Gentleman of the forum thank you for all of your feedback. I will take all of these good suggestions and next time I am a diagram I will make the text larger. Further I will explore some of he suggestions made about the car problem. Lastly, I welcome anymore helpful hints.

Directly responding to Kerry s suggestion, I cannot locate where the green hose with the yellow line goes inside the engine compartment. Toomany MBZ said that the green hose is the for climate control.

Thanks

Brown is for shutoff. Get a mityvac and test the shutoff control valve at the back of the injection pump. If it shuts off normally when you apply vacuum with the mightyvac then the problem is a leak in the total vacuum system. If it does not shut off quickly with the application of vacuum using the mityvac then it is the shutoff diaphragm. Replace the shutoff diaphragm and you will be fine.

If it is a leak in the total system then you must isolate each major component of the system to determine which section of the vacuum system has a leak

Dave

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1970 220D, owned 1980-1990
1980 240D, owned 1990-1992
1982 300TD, owned 1992-1993
1986 300SDL, owned 1993-2004
1999 E300, owned 1999-2003
1982 300TD, 213,880mi, owned since Nov 18, 1991- Aug 4, 2010 SOLD
1988 560SL, 100,000mi, owned since 1995
1965 Mustang Fastback Mileage Unknown(My sons)
1983 240D, 176,000mi (My daughers) owned since 2004
2007 Honda Accord EX-L I4 auto, the new daily driver
1985 300D 264,000mi Son's new daily driver.(sold)
2008 Hyundai Tiberon. Daughters new car

Check the sticky at the beginning of this section.
I had a problem with the engine shutting off with the key, (SD) I pulled vacuum on the shut off actuator/shut off valve under hood, it stopped. I also noticed oil in that brown line and a puddle on the lower kick panel below the steering wheel. I replaced the failed actuator, no more oil leak and the engine stops with the key.

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83 SD

84 CD

I'm with toomany MBZ. From your description, it sounds like you need a new valve.

I connected the mityvac to the brown tube of the shut off valve and it took three pumps to shutoff. It didn't shut right off, it faded away. Also oil was sucked out of the shut off valve when vacuum was applied with the mityvac. About 8in of oil was sucked up into the 1/2" tube from the mityvac. So I think this means I need a new shut off valve.

On the weirder side of thing about doing the procedure could have temporarily fixed the problem because the engine is now shutting off in a timely fashion. My hypothesis is the the oil that was sucked out of the valve and them pushed back in lubed up the components and made a better seal, hence temporarily fixing the problem.

Lastly, what do I do with the oil that is in the shut off valve. Leave it? Mityvac it out? Or will the problem be solved when I replace the shut off valve? Oh what to do.

Thanks again for the help