Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help

Go Back   PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Diesel Discussion

LinkBack Thread Tools Display Modes
Old 01-17-2007, 11:12 PM
firemediceric's Avatar
1981 300 SD
Join Date: Jul 2006
Location: Vero Beach, FL
Posts: 351
126 fuel sender location

I took the time to try and track down a very minor mystery fuel leak today that is originating somewhere behind the back seat, as the leak is evidenced on the underside of the car, forward of the rear axle and just behind the exhaust resonators. Itís not leaking enough to leave a mark on the driveway, but the underside of the car in this area is coated with WVO.

I wanted to expose the fuel tank to see if maybe there was a leak in it or if fuel was getting by the o-ring on the fuel sending unit when I have the tank full. In preparation I searched the archives and printed off reams of paper including

240D fuel tank removal and cleaning


W126 removal of 1st aid kit box

as well as

All of these talked about accessing the fuel sender through the first aid box. Well on my car the fuel sender is accessed from behind the seat back, not through the first aid box. I sure am glad I stumbled across that access point before removing the parcel shelf in order to remove the first aid box.

I never did find the leak even after exposing the entire fuel tank. With the exception of the underside of the car, everything is dry including the fuel lines under the tank. I may be seeing some seepage around the nut of the fuel strainer, but I canít imagine a bad o-ring there would cause the wide spread mess Iím seeing, and besides, itís not that messy at that nut.

The day wasnít a total loss. I changed the oil, put some pool noodles in the back seat (what a huge improvement) and learned a little bit more about the car. Maybe this post about the location of the sender on this model will help out someone as ignorant as myself.

Here's some pictures of the fuel sender access:

Attached Thumbnails
126 fuel sender location-dscn0223.jpg   126 fuel sender location-dscn0224.jpg   126 fuel sender location-dscn0225.jpg  
Pictures of the MB:

1981 300 SD with a Goldenrod water block and Injetor line heaters. EGR is missing

1999 F-350 with HP X-over, Dahl 100 Fuel Filter, Coolant by-pass filter, CCV mod, Tymar intake.

Both on single tank WVO blend
Reply With Quote
Old 05-30-2010, 02:05 PM
Renntag's Avatar
User Especial
Join Date: Jul 2008
Location: Kona, Hi
Posts: 1,396
Originally Posted by firemediceric View Post
.... learned a little bit more about the car. Maybe this post about the location of the sender on this model will help out someone as ignorant as myself.
..You cant be that ignorant !

Thanks. This was a big help.
83 300TD (need rear wiper assembly dead or alive)
84 300SD Daily driver
85 300TD almost 400k miles and driven daily.
98 E300D *sold
86 300SDL *sold and made flawless 10 hour journey to new home.
Reply With Quote
Old 09-16-2010, 01:46 PM
Registered User
Join Date: Aug 2010
Location: Bye Bye Michigan winters... Hello Florida Keys
Posts: 39
Talking W126 fuel sending unit

I ran into the same problem on my 1991 350SDL. I've looked all around the trunk area under the first-aid kit. Looked at the pic of others removing it, everything. It was driving me crazy. What a big help. Thanks, Robert
Reply With Quote
Old 09-16-2010, 10:00 PM
cirrusman's Avatar
Just add Diesel.
Join Date: Aug 2008
Location: Salt Lake City, Utah
Posts: 587
Huh... waddya know. I just removed my rear seat to do some CV boot work and didn't see anything. Of course, I wasn't looking for anything in that department and I didn't take the cover out... good to know


1983 Mercedes Benz 300SD - Wife calls him "Chitty Chitty Bang Bang"

1983 Toyota Tercel (Tommy, The little Toyota that could)
1965 Ford F100 (Grandma Ford)
2005 Toyota Sienna (Elsa, Wife's ride)

1988 Toyota Pickup
2004 Subaru Outback

1987 Cadillac Fleetwood Brougham
1986 Volvo 740 GL Station Wagon - Piece of junk.
1981 Volvo 242 DL 2 Door - Hated to see it go. R.I.P.
1987 Pontiac Fiero GT
Reply With Quote


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On

All times are GMT -4. The time now is 12:47 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2021, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page