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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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Old 10-27-2011, 11:07 PM
bluebee's Avatar
bluebee bluebee is offline
Seek to understand,^Value
Location: San Jose, California
Join Date: Mar 2008
Posts: 25,236
Mein Auto: 02 BMW 525i M54 auto 130K
2002 M54 engine Sucking Jet Pump

Note: The 2002 525i Realoem diagram for the F connector hoses is wrong:
Engine => Vacuum control => Vacuum control - engine

The large hose coming out of the F connector connects to the metal pipe of the sucking jet pump:

Here is a closeup of that sucking jet pump (with the large hose disconnected):

Notice right behind it is a port with a vacuum endcap that can degrade causing vacuum leaks:

Here is a picture of that vacuum port with the endcap removed.

My theory is that this vacuum port 'was' used to connect to the CCV vacuum port when the CCV had a vacuum port that wasn't likewise plugged; but that's just a guess.
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