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Old 01-30-2009, 11:15 AM   #1 (permalink)
BenzWorld Member
Date registered: Dec 2007
Vehicle: 250 TD W124 RHD 1989, E300 TD 1999
Location: England
Posts: 87
w124 td diesel tank filter

I have a 1989 250 TD and have been having some problems with fuel blockages. ( see previus post for details)
Anyway I finally got the towbar undone enough to be able to get at the drain plug under the diesel tank. Next problem is I can't shift the plug at all.

1) can any one confirm that the plug undoes anticlockwise as seen from below (spent a lot of time there today ;-) ) ?
2) any hints on getting the thing to move - I tried heating it up a bit with a blow torch but didn't want to over do it ?


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Old 01-30-2009, 02:20 PM   #2 (permalink)
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Date registered: Oct 2007
Vehicle: E36T AMG, 500GE
Location: Germany
Posts: 122
1. yes
2. just a big wrench
3. be careful - you have not full tank

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Old 01-31-2009, 01:37 AM   #3 (permalink)
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Date registered: Apr 2008
Vehicle: 1995 E300D W124
Location: East Anglia (UK)
Posts: 44
I hate to add to your woes, but after you've cleaned the tank filter & got everything running OK, beware of the injector spill pipes blowing off! My 300D had this problem a few hundred miles after I bought it and I eventually discovered that the fuel return line was blocked at it's end, inside the fuel tank!
Apparently the car had stood for 2 years with very little fuel in the tank and algae had grown in there. Somehow,, it was able to get through the system, but finally caused a blockage - and it also messed up the fuel level sender! The float was stuck to the bottom of the unit, but I managed to free it up. (I cured the blockage by cutting the plastic return pipe inside the tank!)
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Old 01-31-2009, 01:19 PM   #4 (permalink)
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Date registered: Dec 2007
Vehicle: 250 TD W124 RHD 1989, E300 TD 1999
Location: England
Posts: 87
Thought some people might like to see the full horror of the strainer as extracted this morning :-)

[IMG]c:\photos\merc strain.JPG[/IMG]

Most of the gunge peeled off in a layer about 1/8 th inch thick

The car has enough power now to drive up the hill where I live - which is nice.

PS I have now swapped out all the non-metallic parts of the fuel system for new replacements, having previously done all the front lines.
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w124 td diesel tank filter-merc-strain.jpg  

Last edited by nickdub; 01-31-2009 at 01:22 PM.
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Old 01-31-2009, 01:24 PM   #5 (permalink)
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Date registered: Sep 2004
Vehicle: '87 300TD/'90 300D/'94 Quattro/'89 Vanagon
Location: Cascadia
Posts: 48,188
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Wow, I'd say you hit the jackpot right there!
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Old 02-01-2009, 04:00 PM   #6 (permalink)
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Date registered: Oct 2006
Vehicle: 1995 E300 Diesel
Location: So. Cal.
Posts: 95
That is incredible! I sure wish you had taken some pics of the job - after seeing yours, I may want to pull my tank strainer just to check its condition.
1995 E300D Special Edition
2002 GMC, 4X4, Crew Cab, Long Bed, 6" lift, 35" tires and lots of other goodies.
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