On my 83 240D, the shutoff valve works fine, but ONLY if the drivers door is locked. It works either way: I can lock the door then shut the car off; or I can turn off the key, then lock the door, then the car will shut off. In addition, the central locking system does not work.

Any idea as to likely location of leak?

__________________
14 E250 Bluetec "Sinclair", Palladium Silver on Black, 153k miles
06 E320 CDI "Rutherford", Black on Tan, 171k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion

19 Honda CR-V EX 61k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife

The unlocking side of the system has a leak.

The yellow/red hose is the unlock and the yellow/green is the lock circuit.

It originates at the master valve in the drivers door and goes out to the pods at all 4 doors, the fuel door, and the trunk.

Time to break out the mighty vac.

I would drive with the doors locked or the locks disconnected until you get it fixed. Constant load on the vacuum pump greatly accelerates its demise.

__________________
The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech

Thanks.

Let's say, for the sake of simplicity, I just want to remove the door locking from the system. What would I disconnect and plug?

__________________
14 E250 Bluetec "Sinclair", Palladium Silver on Black, 153k miles
06 E320 CDI "Rutherford", Black on Tan, 171k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion

19 Honda CR-V EX 61k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife

under the hood, there is an octopus connected to the yellow hoses... remove it from the vacuum line, and plug where it was.

__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
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My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

Excellent...thanks. Works perfect.

Just out of curiosity, what are the two lines running adjacent to the yellow lines and coming off the same vacuum lead? One's orange and one's yellow/green. Whatever those are, I disconnected downstream from them so they're still intact.

__________________
14 E250 Bluetec "Sinclair", Palladium Silver on Black, 153k miles
06 E320 CDI "Rutherford", Black on Tan, 171k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion

19 Honda CR-V EX 61k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife

So now shutoff works fine....and I don't really care about the central locking system. But, if I were to troubleshoot it, am I correct to assume it involves removing the drivers door panel?

__________________
14 E250 Bluetec "Sinclair", Palladium Silver on Black, 153k miles
06 E320 CDI "Rutherford", Black on Tan, 171k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion

19 Honda CR-V EX 61k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife

You can start trouble shooting under the mats. Once you narrow down the leak, you can remove the panel needed.

__________________
Chad
2006 Nissan Pathfinder LE
1998 Acura 3.0 CL
OBK#44
"Pleasure in the job puts perfection in the work." - Aristotle (384-322 B.C.)

SOLD
1985 300TD - Red Dragon
1986 300SDL - Coda
1991 - 300TE
1995 - E320
1985 300CD - Gladys

UMMM actually it is the Yellow/Red for lock, and Yellow/Greem for unlock.

Anyway, read through this thread on running down you vacuum issues. It is all very simple to do.

Green line is for the under dash vac pods for the heat/ac.
Brown lines for the fuel shut off.

My guess is one of your door actuators is leaking.

As Chad mentioned, start by lifting the carpet on the drivers side, and you will see the vac lines, and rubber connectors.

W123 Vacuum InterLock Diagram


Charlie

__________________
there were three HP ratings on the OM616...

1) Not much power
2) Even less power
3) Not nearly enough power!! 240D w/auto

Anyone that thinks a 240D is slow drives too fast.

80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff

We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works

Not trying to be difficult but the picture in the linked post shows green for lock and red for unlock.

Just trying to get this right for the OP.

The definitive answer is to look at the fuel door pod. It only has 1 hose and uses vacuum to lock and a spring to unlock on a 123. Whatever color hose is on the fuel door pod is the "lock" circuit.

__________________
The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech

OK I stand corrected, I was sure I had read it was red for lock, and I have chased down the leaks in my cars and a few others, and it was red for lock.

Guess Iam just getting old and confused.

Charlie

__________________
there were three HP ratings on the OM616...

1) Not much power
2) Even less power
3) Not nearly enough power!! 240D w/auto

Anyone that thinks a 240D is slow drives too fast.

80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff

We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works

So it looks like what I did (just wanting to confirm that this is fine for now) is disconnect the vacuum supply to driver's door (plain yellow) and vacuum reservoir (yellow with grey stripe). Car shuts off fine.

Do I need the vacuum reservoir for anything while the car is running?

I tried ONLY disconnecting the plain yellow line. Not only would the car not shut off with the key, but it wouldn't shut off with the stop lever! That surprised me.

__________________
14 E250 Bluetec "Sinclair", Palladium Silver on Black, 153k miles
06 E320 CDI "Rutherford", Black on Tan, 171k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion

19 Honda CR-V EX 61k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife

shertex,

The old Performance Parts catalogs from ten years ago had vacuum line diagrams in them. Maybe the Performance Parts people can provide you with these diagrams from an old paper catalog. It's been a long time since I went through it, but as I recall, you start at the drivers door and then go either to the drivers side rear or toward the right doors, then down the line from the right doors, the end of the line is the fuel filler door lock.

Hope this helps.

__________________
2001 SLK 320 six speed manual
2014 Porsche Cayenne six speed manual

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