Thread: Where does the oil in the vaccum line come from?
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Old 09-28-2003, 01:02 PM
Toblin Toblin is offline
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Join Date: Sep 2003
Location: Central, NJ
Posts: 246
A bad diaphragm in the vacuum pump would lead to the symptoms you describe. Another indicator of a faulty diaphragm is the appearance of oil in the air filter housing as well as in the hose that runs from the vacuum pump to the air filter housing.

It’s an easy job to replace the diaphragm once you get the pump out. Unfortunately, it’s a mojor PITA to get the pump out. Good luck.
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'79 300D, "Liesel von Diesel", 235K

I kid proofed the house....but they still get in
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