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Old 01-25-2009, 01:05 AM
joro's Avatar
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Join Date: Dec 2005
Posts: 192
Exclamation 300td hydraulic fuel leak

I have a leak of the hydraulic fluid either at the high pressure side hose or at the pump itself,i cannnot determine wich one is leaking but it is in that area because i see it every day,i just changed the low presssure hose because it was saturated and old and i thought it was the problem,but now with anew low pressure return hose im still losing and spilling quite a bit of the fluid,the problemis that when i have someone rev up the car i get all this wind from the fan in the area that i cannot tell if its coming form the hose or the pump,i am quite bummed and any help would be apprecialoved.
W123 1985 300td
thanks all!
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Old 01-25-2009, 01:31 AM
Registered Hack
Join Date: Mar 2008
Posts: 4,602
Because I love your personology and unique wording (aprecialoved) so much, I am going to tell you that it is most likely your high pressure line on its last leg... if it had one.

Do a search for 'repairing sls hose' and find the thread by Kerry. All the details are there.

However, it could be the pump. Its simply more efficient to inspect the line first. Mine failed in that exact spot - it receives the most stress.

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Old 01-25-2009, 01:42 AM
JimmyL's Avatar
Rogue T Intolerant!!!
Join Date: May 2004
Location: Sunnyvale, Texas (DFW)
Posts: 9,673
On all 3 wagons I've owned, or still own, I've had to replace the high pressure hydraulic hoses. First it was a small leak, almost an aggressive seep, then it turned into a full fledged geyser!!!
I've had one pump seal fail also, but you could see the fluid pouring from the bottom between the 2 halves.
Take your hose to a hydraulic hose shop and they will use your end pieces and make you a new one. Much more a sure thing then the self hose replacement others have tried. Limited success apparently.
All mine were around $62-64 bucks apiece to have done.....
Jimmy L.
'05 Acura TL 6MT
2001 ML430 My Spare

'95 E300 188K "Batmobile" Texas Unfriendly Black
'85 300TD 235K "The Wagon" Texas Friendly White
'80 240D 154K "China" Scar engine installed
'81 300TD 240K "Smash"
'80 240D 230K "The Squash"
'81 240D 293K"Scar" Rear ended harder than Elton John
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Old 01-25-2009, 10:58 AM
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Join Date: Jan 2002
Posts: 18,353
I don't think anyone has had any problems replacing the hose themselves if they used the correct hose. Failures have been associated with hoses with inadequate pressure ratings I believe.
The thread mentioned above details the repair. It's easy and inexpensive.
1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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