Where does the vacuum line plug in... - Mercedes-Benz Forum
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post #1 of 17 (permalink) Old 11-20-2013, 05:36 PM Thread Starter
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Where does the vacuum line plug in...

…the short one that hangs off of the oil vapor retune line that comes off of the valve cover and goes into the air cleaner housing? It's a short line with a rubber fitting on the end shaped like a little flying saucer. I searched everywhere and cannot find a hole to stick it in! Thanks.

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post #2 of 17 (permalink) Old 11-20-2013, 07:08 PM
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IDK 6's that well, or at all, but it sounds like the fuel pressure regulator?

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post #3 of 17 (permalink) Old 11-20-2013, 08:56 PM
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mclare is right, it goes into the back of the fuel pressure regulator which is strapped to the fuel distributor at about 7 o'clock as you view the FD from the driver's side.. If you don't know what it is, look for a cylindrical part about 5" long with a hard fuel line coming out of one end and headed toward the driver's fender, and a hole for your flying saucer at the other end.
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post #4 of 17 (permalink) Old 11-20-2013, 09:15 PM
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.


6 cylinders






8 cylinders









.
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post #5 of 17 (permalink) Old 11-21-2013, 12:59 PM Thread Starter
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AhHa! My FR is plugged

It's got a rubber (black) plug in that hole on the regulator body: no tube extending out from it. So there is nowhere to stick the end of the vacuum line. Funny, my mechanic just stuffed it under the air cleaner, dangling. Guess it's not needed. Hmmm.
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post #6 of 17 (permalink) Old 11-21-2013, 03:46 PM
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Funny, my mechanic just stuffed it under the air cleaner, dangling. Guess it's not needed. Hmmm.
Everything is needed on these cars, everything has a purpose, but what do I know, I just am a nobody. What I do know is that if your mechanic stuffed it under the air cleaner, you do need ... another mechanic (that does not cut corners).

It will not be easy to get it back into the FPR. I got some back and had the FPR out and it was not easy. When is on the car, is even harder and I would be surprised if you get it in w/o braking it. Examine first the rubber fitting to make sure it not broken before you try to insert it. If it is, don't bother, replace the rubber fitting first with a new one first.

If it was me, I would take advantage that the fitting is out, eaxmine it first, and if needs replacement I would order one/some first and then install it.
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post #7 of 17 (permalink) Old 11-21-2013, 03:51 PM
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It's got a rubber (black) plug in that hole on the regulator body: no tube extending out from it. So there is nowhere to stick the end of the vacuum line. Funny, my mechanic just stuffed it under the air cleaner, dangling. Guess it's not needed. Hmmm.
This is the way it should look with the fitting installed. The "saucer" part is inserted, you don't see it.
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post #8 of 17 (permalink) Old 11-21-2013, 08:25 PM
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Guess it's not needed. Hmmm.

It is, very much so. Listen to liviu165.


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post #9 of 17 (permalink) Old 11-21-2013, 11:26 PM
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I drove my 300SE for months and months without that tube attached to the FPR. Did not notice any issues performance- or MPG-wise.

Then I finally bought a new rubber insert (there was actually no difference to the old one I had; probably just gotten loose somehow !) and found out that with reasonable effort, I was not able to get it into the orifice of the FPR (while everything in place in the engine compartment). The lazy man's solution was then to invert the rubber insert, cut the other end enough to fit in the vacuum tube and stick it in (went way easier). That's the way it has been ever since...

W 126 300SE -90 anthrazite grey, > 550 000 km +
W 123 200D -84 classic white, > 585 000 km
(W 140 S320 -95, blue black, > 300 000 km, wife's)
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post #10 of 17 (permalink) Old 11-22-2013, 03:34 AM
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I cannot tell you the level of foul language trying to get the *&^)*%(_@ back into the FPR with a new rubber insert. Like most, mine was virtually melted/dryrotted away and my line coming off the psgr side valve cover was just sitting inside of it. So I have kite string and scotch tape for this, remove the FPR and try that way or, wait for it,......... removed my belt to the airpump and I am not sure it matters anymore


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