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  #1  
Old 03-27-2001, 12:35 AM
public enemy
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My fuel pressure regulator on my 88 300E has a vacuum line coming out of it. I bought the car used and the vacuum line is disconected. Does anybody know where it connects to? Thanks for any help.
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Old 03-27-2001, 12:49 AM
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Join Date: Mar 2001
Location: Northern California
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On my 190E the Vacuum line connects between the egr valve and the idle speed control valve.
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Old 03-27-2001, 01:07 AM
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I do not think that there is an EGR valve on mine, but I am not sure.
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Old 03-27-2001, 11:52 AM
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Come on guys, somebody has to know where the vacuum connects.
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Old 03-27-2001, 07:14 PM
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Join Date: Nov 2000
Location: Tribune, Kansas. I farm for a living. I fly R/C airplanes for fun.
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If it is what I think it is, the line from the regulator goes up to the black rubber hose that connects between the air cleaner housing and the crankcase breather.
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Ron Miller

1986 300E
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Old 03-28-2001, 02:40 AM
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Thanks people, but I thought that this is a vacuum hose and should be connected to some sort of vacuum source such as intake manifold or something. This rubber connection between the air cleaner and camshaft cover is not a vacuum source. I do not doubt that it may connect there, I am just curious as to why...
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Old 03-28-2001, 04:11 AM
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On the 190E this hose is connected to a vacuum source which is the idle speed control valve. The back end of the idle speed control valve is connected to a vacuum source and I think it is called auxillary air device (basically a vacuum pump)
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  #8  
Old 03-28-2001, 07:21 AM
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Vacuum hose

On my 300SL-24 the vacuum line coming out of the fuel pressure regulaotor hooks up to a black hose that links the air-filter box to the valve cover as well.
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