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  #1  
Old 06-08-2014, 07:04 PM
WillW
 
Join Date: Oct 2012
Location: Austin,Texas
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Vacuum pump question (Now with Pictures!)

Today while looking under the hood for trouble. I found that the vacuum hard line from the pump to flex hose connector was loose. The fitting is right behind the steering pump filter if that helps you to visualize what I'm talking about. I wasn't having any problems with anything that runs on vacuum so I just tightened up the line.

But what I saw made me curious. The vacuum line goes directly back to the brake system firewall with no branches along the way. But I have vacuum lines around the engine, so I looked for their source. The lines all run back to what looks like a small electric vacuum pump in front of the right wheel well and behind the head light.

I don't think I've ever heard tell of an auxiliary vacuum pump. Was I asleep and missed this? It looks stock, but I can't find it in the service manual.

The plastic bracket that holds the little electric pump is broken and the pump is just sitting there in the wheel well. I'd like to fix and/or replace it but I'm at a loss as to where to go. Any help would be nice.

Attached Thumbnails
Vacuum pump question-mainvacline.jpg   Vacuum pump question-auxpump.jpg  
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Last edited by willw; 06-10-2014 at 12:46 PM.
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Old 06-08-2014, 09:07 PM
fashion victim immunizer
 
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w126 has a separate pump for the door locks. however it was my understanding that it is mounted in the trunk. maybe early w126 has the pump in the engine bay? or maybe someone moved it and thats why it is just sitting there.
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Old 06-08-2014, 09:13 PM
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Pictures are essential in ID-ing what you've got and suggestions for fixing, as needed.
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Old 06-08-2014, 09:17 PM
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I don't know of any MB of that vintage with an electrically operated vacuum pump for engine auxiliaries. The 126 did have an auxiliary pump in the trunk for the door locks. The 123s of that era used manifold vacuum (gas) or engine driven vacuum pump (Diesel) for all engine controls (shutdown, EGR, transmission shifting control), door locks, and climate control flap actuation.
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Old 06-08-2014, 11:15 PM
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+1 on pictures...
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Old 06-10-2014, 12:54 PM
WillW
 
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Added pics to the main post

You want pictures? You get pictures :-)
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Old 06-10-2014, 01:19 PM
Registered Hack
 
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That is not a vacuum pump.

I believe it is the "vacuum converter" that signals the egr valve
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Old 06-10-2014, 01:47 PM
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check the right wheel well in the trunk for the pump

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