W114 gas smell - Page 2 - Mercedes-Benz Forum

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post #11 of 49 (permalink) Old 08-12-2013, 06:49 PM
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If I remember correctly on the M130 there was a hose which attached between the carbs to the air cleaner. The PCV / vapor canister vented to this hose. The set-up you have is venting the PCV fumes to atmosphere which is going to cause an oil mess around the fill cap area.

Two ways you can go. Find a filter base plate with a fitting and connect the vent/PVC hoses to it or create an open to atmosphere, filtered vacuum leak contained in a canister which is what I'l probably end up doing on mine.
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post #12 of 49 (permalink) Old 08-12-2013, 08:22 PM Thread Starter
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This filter does not allow the oil to come out
It is designed for this setup
The hose from the original air filter was going into this opening

I don't I understand your second paragraph


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Last edited by kavadarci; 08-12-2013 at 08:24 PM.
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post #13 of 49 (permalink) Old 08-13-2013, 05:15 PM Thread Starter
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Mike
I think I know what are you referring too
Here is a picture of the carbs above and there is a funnel like tube between
If I put my finger on there it sucks air and the engine idle comes down
W114 gas smell-imageuploadedbyag-free1376435444.507111.jpg

Also what is the purpose of the big tube that comes from the exhaust and goes into the air filter?
Here is a picture of where the tube should go
I have it open now
W114 gas smell-imageuploadedbyag-free1376435503.068725.jpg

I have also taken some pictures from under the tank
The first one is on the right hand side when you look directly to the back of the car and the hoses seem to be going back into the trunk
W114 gas smell-imageuploadedbyag-free1376435580.186708.jpg
The second is from the left hand side and the hoses are going towards the engine
One towards the fuel pump
The other towards the first carb
Both require replacement
W114 gas smell-imageuploadedbyag-free1376435647.920496.jpg

So what I am thinking based on what you described is to put the original air filter and see if there is any gas smell
If there isn't I would still prefer to have the k&n filter and will work towards that setup

Thank you


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post #14 of 49 (permalink) Old 08-13-2013, 06:36 PM
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The "funnel like" tube was originally part of the PCV/vent system. It is what provided the lower pressure part of the venting scheme of which I made reference.

Here's what you can do to make the system work with the K&N set-up. You'll need to replace the open vented cap with an elbow fitting. Fit a bit of tubing between the elbow and the open vacuum fitting. Install a "tee" fitting in the new line and connect the black plastic line from the left hand frame rail to this "tee". You have now re-created the PCV/venting system.

You cant just connect the vent to the line because it will collapse your gas tank. No, I am not kidding. The system needs to be "open" and not act as a vacuum storage system.

In case you are wondering, the two small lines from the side of your tank are the vents. They lead to the plastic tank in the trunk where the large plastic line sucks the fumes and send them into the intake system.

The "big tube" is a part of the "warm-up" system. It allowed heated air from the exhaust manifold to rise into the air filter area for quicker operation on cold days. Not really needed. Leaving it open won't hurt.

Last edited by Mike D; 08-13-2013 at 06:45 PM.
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post #15 of 49 (permalink) Old 08-13-2013, 06:54 PM Thread Starter
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Perfect
I put everything back together and will drive it tomorrow
I sure hope this fixes the smell as I think I might have mild gas poisoning :-(

Thank you Mike
I will advise tomorrow


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post #16 of 49 (permalink) Old 08-13-2013, 07:10 PM
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post #17 of 49 (permalink) Old 08-13-2013, 07:12 PM
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I ran into this same problem when I changed my M115 from dual carbs to EFI and the work around fix I mentioned is what I ended up doing.

p.s., this is also how I know about sucking the gas tank closed.
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post #18 of 49 (permalink) Old 08-13-2013, 07:50 PM Thread Starter
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Mike
I got you all the way to the tee
Which black plastic kind go I connect the tee to?


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post #19 of 49 (permalink) Old 08-13-2013, 07:53 PM
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Try again?
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post #20 of 49 (permalink) Old 08-13-2013, 07:59 PM Thread Starter
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Honestly I am lost
I am sorry

Here is a picture of my engine
Can you describe again please?

W114 gas smell-imageuploadedbyag-free1376445577.635552.jpg


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