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#1
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What should that open-ended vacuum line be connected to ?
Hi,
I removed the air filter housing (1990 300CE) and found an open-ended vacuum line, at the other end it is connected to some part (with the blue dot, what is it called?), which is in turn connected to the fuel distributor. What should the open end be connected to. Is it something which causes my engine run too rich?
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1996 E320 since 1/16/08, 171K miles as of Feb 2011 --------------------------------------------------------- 1989 300CE - R.I.P. Dec 29 2007 Other MBs (sold): 1992 300E-24 - 1979 350SLC - 1984 230E - 1990 300CE |
#2
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That item with the blue dot is the fuel pressure regulator. Inside it there is a "rubber" diaphragm that helps in the regulators operation. If the diaphragm is damaged then fuel can escape out that line you are questioning. This line is not a vacuum line, it is a fuel escape line. It plugs into the rubber hose which runs between the valve cover and the air cleaner cover - item 1 in the image below. Note that the image shows the rear of the interconnecting hose. If you check the other side you will find an inlet into which your mysterious hose fits into.
Item 1 in this image. |
#3
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I wondered the same thing, but sort of came to that conclusion on my own.
Whilt at this topic, Lets say there was a fault in the regulator..what would some symptoms of a bad fuel pressure regulator be?
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RIP: 80 300SD RIP: 79 450SEL 2002 E430 4matic (212,000km) 2002 ML500 'sport' ____________________________ FACEBOOK: PANZER450 |
#4
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Quote:
__________________
1996 E320 since 1/16/08, 171K miles as of Feb 2011 --------------------------------------------------------- 1989 300CE - R.I.P. Dec 29 2007 Other MBs (sold): 1992 300E-24 - 1979 350SLC - 1984 230E - 1990 300CE |
#5
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No. Goes into item 1. This is an image of the rear side. On the front side you will find a small slot to plug your line into.
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#6
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Yes, I found the hole and plugged the line into that. Thanks a lot.
__________________
1996 E320 since 1/16/08, 171K miles as of Feb 2011 --------------------------------------------------------- 1989 300CE - R.I.P. Dec 29 2007 Other MBs (sold): 1992 300E-24 - 1979 350SLC - 1984 230E - 1990 300CE |
#7
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Quote:
This is a pain to diagnose without the proper diagnostic equipment. The symptoms of a faulty fuel pump regulator include rough running or bad idle. You generally start to chase all the other components in the KE system for the fault condition. If you see fuel in that escape hose then you know it's knackered. |
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