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  #1  
Old 07-14-2007, 02:29 PM
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Need help to identify this part

Spending another weekend trying to track down my hard hot start problem on my 1984 500SEC. Ready to install new injectors, seats and seals. Found what appears to be a weeping fuel hose directly above the rear axle and below the fuel tank. Small hose weeping is about three inches long.
Anyone know what kind of fuel line this is? Under pressure or return?

And what is the part that appears to be a filter or damper attached to the line? Thanks in advance. Dan

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Need help to identify this part-500sec-007.jpg  
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Old 07-14-2007, 03:58 PM
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I guess it's a hydraulic oil valve (but not sure). Do you have a self-leveling rear suspensions or ADS?
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Old 07-14-2007, 06:16 PM
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Quote:
Originally Posted by zcc View Post
I guess it's a hydraulic oil valve (but not sure). Do you have a self-leveling rear suspensions or ADS?
No. The 1985 and later models have that. Mine is a 1984, and the picture is definately of a fuel line. Just not sure what type. Or the purpose of the thingy attached to the line.
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Old 07-14-2007, 07:34 PM
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Just a guess, but looks like it could be a fuel pressure valve of an older vintage.

http://catalog.worldpac.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=1VX0OZ4D924S15TCR8&year=1985&make=MB&model=500-SEL-001&category=All&part=Fuel+Pressure+Regulator
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  #5  
Old 07-14-2007, 08:21 PM
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It's called a fuel tank vent valve. There's two different versions that work - 1074700993 and 1234700393.
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Old 07-14-2007, 09:13 PM
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Originally Posted by deanyel View Post
It's called a fuel tank vent valve. There's two different versions that work - 1074700993 and 1234700393.
Thanks for the info. But how does it work. If venting is needed, where does the valve vent to? Or from?
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Old 07-14-2007, 10:02 PM
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The vent is from the fuel tank, and it vents to the intake manifold thru charcoal cannister.
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Old 07-14-2007, 10:03 PM
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Quote:
Originally Posted by deanyel View Post
It's called a fuel tank vent valve. There's two different versions that work - 1074700993 and 1234700393.
Well with your help I just answered my own questions. You identified the part. With that I then knew where to look in my shop CD. The vent valve vents to the charcoal cannister. Thanks
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Old 07-15-2007, 12:02 AM
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Quote:
Originally Posted by romansek View Post
The vent is from the fuel tank, and it vents to the intake manifold thru charcoal cannister.
The vent valve(at the fuel tank) is getting replaced along with it's weeping fuel line. However following the vent line up to the charcoal canister, I discovered another valve that appeared to be tired. This valve has three line connected to it. And appears to be leaking. My shop CD identifies this valve as a vent valve purge. I found both valves online at Mercedes Benz Parts Direct. Reasonably priced too.
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Old 07-15-2007, 12:39 AM
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I forgot the exact name. It may be called a purge valve or something like that. In any case it has to do with the evaporative emmision system. I will be under fuel tank pressure so if you remove the gas cap it will not be under pressure and liquid gas should not come out of is or the line its attached to.

John Roncallo

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