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  #1  
Old 01-12-2018, 08:58 AM
Bengoshi2000's Avatar
1991 300D 2.5 Turbo
 
Join Date: Jan 2011
Location: NC, USA
Posts: 180
Fuel Sending Unit Seal?

In the process of replacing/upgrading the radio in my 1991 300d, I pulled all of the trunk liners. Now, with a full view of the fuel tank, I can tell that the sending unit seal is weeping somewhat. There's a ring of seeping diesel that has spread out around the sending unit opening... slightly wet to the touch and smells like diesel.

I've been searching here (and on other parts sites) and can't seem to locate a sending unit seal. I assume it's just and o ring of some sort. Can someone point me in the right direction?
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1991 300D 2.5 Turbo "Meiner Schatz"
2002 Golf TDI "der Zauberer"
2006 Honda Pilot "die Muttergöttin"

"You can do it that way... but it's like using proto-matter to build a Genesis Device."
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  #2  
Old 01-12-2018, 09:48 AM
Diseasel300's Avatar
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Join Date: May 2016
Location: Texas Hill Country
Posts: 3,171
You're correct that it's an O-ring. You might try just giving the sending unit a good snug and see if it stops. The one on my '86 was still flexible and supple, so I just put it back in when I cleaned my sender.

The seal is in a weird place on Pelican's site, it's under "Electrical" since it's tied to the sender. From my '86, but your '91 should use the same seal: https://www.pelicanparts.com/catalog/SuperCat/3342/MBZ_3342_ELSENS_pg1.htm#item3
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  #3  
Old 01-12-2018, 01:13 PM
Bengoshi2000's Avatar
1991 300D 2.5 Turbo
 
Join Date: Jan 2011
Location: NC, USA
Posts: 180
That's the ticket... many thanks! I'll try snugging it up first.
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1991 300D 2.5 Turbo "Meiner Schatz"
2002 Golf TDI "der Zauberer"
2006 Honda Pilot "die Muttergöttin"

"You can do it that way... but it's like using proto-matter to build a Genesis Device."
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