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Replacing your Vacuum Supply Pump on your Mercedes Benz
 
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Pelican Technical Article:

Replacing your Vacuum Supply Pump on your Mercedes Benz

Steve Vernon

Time:

1 hour1 hr

Tab:

$160

Talent:

*

Tools:

Pliers

Applicable Models:

 
Mercedes-Benz W124 (1986-95)
Mercedes-Benz W126 (1981-91)
Mercedes-Benz W201 (1984-93)

Parts Required:

New pump

Hot Tip:

Be careful with old vacuum lines

Performance Gain:

Working locks

Complementary Modification:

New actuators

The two main components of the vacuum locking system on the Mercedes-Benz W201 are the actuators and the supply pump. If your main supply pump has failed, replacement is a lot easier than the actuators, just be careful working with the connections on the old vacuum lines, while they are sturdy, most of them are over twenty years old now.

Begin by removing the back seat. There are two small, red metal clips under the center of both the passenger and driver side rear seats. Push these clips in while pulling the seat up and away from the back.

With the seat out you will see a foam box under the passenger side. The supply pump is located in the foam box to help protect it from heat and vibrations. Simply pull back the top cover of foam and then carefully remove the vacuum lines going into and out of the old supply pump and replace with a new one.

Installation is the reverse of removal.

Locate the two metal clips under the center of the passenger and driver side rear seats (red arrows).
Figure 1

Locate the two metal clips under the center of the passenger and driver side rear seats (red arrows).

Push both clips in while pulling the seat up and forward.
Figure 2

Push both clips in while pulling the seat up and forward.

The supply pump is in a foam box under the passenger side rear seat.
Figure 3

The supply pump is in a foam box under the passenger side rear seat.

Fold back the lid of the foam box and disconnect the vacuum lines marking where they go.
Figure 4

Fold back the lid of the foam box and disconnect the vacuum lines marking where they go. Install the lines in the new pump

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Comments and Suggestions:
Will Comments: Hi, love you're help section and diagrams. I have a 1992 mercedes 300e. While changing air filter I broke vacuum line from air cleaner..spliced it but still various problems from Ac/ vents to difficult to start. I would like to replace the vacuum line but I can't see where but goes. I'd their a diagram and do you sell the proper vacuum line.it seems to be shielded where it comes close to manifold.
November 8, 2016
  Followup from the Pelican Staff: I don't have the vacuum diagram to share. BUT - I recall there being one main line that runs from the intake to the firewall, for the HVAC. Repair the leak in that line and you should be good to go. - Nick at Pelican Parts  
Kamil1990 Comments: Im could not find anything how to fix my problem that is related to lockiing system.One day when I tried to lock the door from the driver's side UK version and when I turned the key I heard a knock in the door lock mechanism I removed the yoke you insert the key and I saw that the spring that is ther was broken so I replaced it and everything looked great but when I put that part back the the door and when I turned the key,Lock didnt work and now I cannot lock the car from the driver's side and Im using passanger side door lock.
August 26, 2016
  Followup from the Pelican Staff: Could be a wiring or vacuum issue, depending what vehicle you are working on. - Nick at Pelican Parts  
Rick Comments: What about the manifold. How does that remove from vacuum pump. I need to remove it so I can check vacuum on pump
February 13, 2015
  Followup from the Pelican Staff: I am not 100% sure on that one. I would grab a repair manual. It will have the procedure, special tools and torque specs.

Give our parts specialists a call at 1-888-280-7799. - Nick at Pelican Parts
 
Rick Comments: How do you remove vacuum lines. Also, how do you remove the vacuum manifold that all the lines are connected to.
February 11, 2015
  Followup from the Pelican Staff: if I remember correctly, press the plastic collar toward the unit and hold, then pull the line off. - Nick at Pelican Parts  

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Page last updated: Wed 12/7/2016 02:25:44 AM