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Discussion Starter #1
I have a slight gasoline odor under the hood of my 420SEL which is quite strong when I use the heater or defroster. I don't see any obvious signs of a leak, but clearly there is one. What do you think the mostly likely causes would be in doing a search? Is there a tool that helps in 'sniffing' out where the problem is?

Thanks in advance...
 

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If there is no obvious leakage at any of the connections (fuel distributor, injectors, etc) I'd suspect the EHA. It has rubber o-rings that go bad with age.
 

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If there is no obvious leakage at any of the connections (fuel distributor, injectors, etc) I'd suspect the EHA. It has rubber o-rings that go bad with age.
Thanks markusfmeyer... but, I don't know what a EHA is. Could you explain what that is and where it's located? Is it something I can replace or should it go in for the repair?

Thank-you...
 

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Another source could be your fuel pressure regulator leaking through it's vacuum line. That happens when its diaphragm fails. Gasoline will be sucked right back in the breather hose.
 

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Discussion Starter #6 (Edited)
The search function is helpful here....

Here's one sample post that should help:

http://www.benzworld.org/forums/w126-s-se-sec-sel-sd/1204086-purpose-eha-valve.html
Thanks markusfmeyer; I sometimes have a slight hard-starting problem, so maybe you have me headed in the right direction... thanks again!

On edit: at first, found nothing in this area but letting the motor run, sure enough, saw a little seepage at the top of the E.H.A. Ouch! $300 to replace the valve, though it's only a couple of dollars to replace the 'O' rings... guess I'll start with that first.
 

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Discussion Starter #7
O.K, got the rubber 'O' rings from my local dealer, more expensive for the part but no shipping fee, so less expensive overall.

Very easy procedure to replace those seals; took me no more than 15 minutes from start to finish. Ran the motor for a few and didn't see any seepage at the top of the EHA, though I have to saw the rings that I pulled out sure looked okay; no tears, cuts, seemed pliable... I'll know in a day or so when driving it if that solved the issue...

Thanks all to those that posted; probably saved myself $65 by doing it myself...
 
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