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Old 10-18-2004, 07:37 PM
Diesel Giant's Avatar
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Join Date: Oct 2004
Location: Loganville/Atlanta
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Need vacuum routing diagram/pic 300 D

Hi all,

The previous "jack leg" that worked on this car, an '84 300 D auto, decided that he had a better idea on how to route the vacuum lines in an around the firewall. I need a very good vacuum diagram that shows color and where the supply lines are supposed to feed into. Or a nice color photo of someones '84 300 D showing the area around the firewall and brake booster and injector pump with the line "properly" connected would be a great help.

Specifics of interest and problematic, is the plastic check valve in the brake booster line with the 2 nipples. One nipple supplies the "bleeder" valve on the top of injector pump and then the tranny modulator etc.. The other nipple supplies the other "stuff". Too much to write out.

Please direct me, or someone post a nice resoulution pic if you have this model car.



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Old 10-18-2004, 08:58 PM
Diesel Giant's Avatar
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Yes I did read ALL the threads in the search area. I really need a clear pic of someones unmolested vacuum hoses properly hooked up. The diagrams I have seen are less than helpful.
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Old 10-18-2004, 09:35 PM
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Join Date: Dec 2003
Location: Metro Detroit, Michigan
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Lightbulb Did you try this link???

Vacuum Diagrams

Or take pictures of yours and we can assist.
That worked well for 1985 300SD Sady...

What area is the problem located in, engine bay, passenger cabin or trunk?
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Old 10-19-2004, 08:58 AM
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Location: Perth, Western Australia
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Diesel Giant

What works? and what doesn't?
From that, we can tell which lines need to be rearranged.
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Old 10-19-2004, 09:46 PM
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Location: Loganville/Atlanta
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ok I have figured out most of the lines but here is a weird situation. Turn the key off, takes 5-10 seconds for engine shutdown. Vac test the shutoff valve directly and it works perfectly and hold perfect vacuum. I installed my vacuum guage between the brown supply line which feeds the shutoff valve and the supply nipple. The vacuum signal occurs when the key is in the off position but only about 5 inches of mercury, hence the slow turn off. Now it get weird. If I immediately restart the car, it idles slow like it wants to cut off because there is STILL some vacuum in the brown supply line. If I cycle the key 3-4 times off-on then start it, it bleeds the residual vacuum off and the shutoff valve is not trying to restrict fuel flow. I do know that I have a vac leak in the drivers door or somewhere in the yellow line with the black stripe. I dont think it is related, just wanted to mention.

Also what does the green line with the yellow stripe power?

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