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  #1  
Old 09-17-2006, 10:57 AM
muleears's Avatar
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Question FUEL LEAK! Please help me identify

I have a '87 124 w/603.96 eng. I don't know what the item is that is leaking all I can do is describe it. It is immediately downstream from the primary fuel filter. It is about 3.5 inches long and has 4 fuel lines attached to it. It is located directly above the motor mount on the drivers (US) side. Is it the lift pump or a valve of some sort? Fuel is dripping out the front where the line from the primary filter attaches. I have loosened and re attached but to no avail. Can it be rebuilt or must it be replaced?

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  #2  
Old 09-17-2006, 12:08 PM
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Sounds like the fuel pre-heater...

Follow the two (presumably metal lines) and they should go around the back of the engine where coolant comes from.

Not sure where this would leak from but it is not a necessary component especially if you live in a warmer climate.

Bill
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  #3  
Old 09-17-2006, 12:28 PM
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I think you are right! Thanks!

Two of the lines connect to two metal lines that disappear behind the engine. I live in SE Virginia (near Norfolk). We get some snow and single digit temps on occasion. Do you think I need it or can I just bypass it? If I need to replace, where can I get one? Thanks again.
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'07 E320 Bluetec 133K my DD
'04 Jaguar XJ8 VDP, 34K
'10 Hyundai Accent 60K Grocery Getter
'02 VW Golf soon to be on the road again
'97 E300 Diesel Son's DD
'61 VERY tolerant wife

Hampton Roads, VA USA

Gone but not forgotten:
'67 250S 95K
'86 300SDL
'87 300D Turbo, 364K! R.I.P.
'98 E300 Turbodiesel, 213K
'02 S420, 164K
'01 Prius 138K
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  #4  
Old 09-17-2006, 03:29 PM
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Mine leaked also, so I bypassed it. Can't really see why it's needed, unless you live in an arctic region.
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  #5  
Old 09-17-2006, 04:37 PM
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Just found out from Phil...$146!!!

I don't know if it is worth it. I am sure the price is fair. But I may just bypass it. What will be the downside? A greater chance of gelling fuel in the winter? I can put the $146 toward improving my AC or a paintjob. If it won't start in January I just won't go to work!
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'07 E320 Bluetec 133K my DD
'04 Jaguar XJ8 VDP, 34K
'10 Hyundai Accent 60K Grocery Getter
'02 VW Golf soon to be on the road again
'97 E300 Diesel Son's DD
'61 VERY tolerant wife

Hampton Roads, VA USA

Gone but not forgotten:
'67 250S 95K
'86 300SDL
'87 300D Turbo, 364K! R.I.P.
'98 E300 Turbodiesel, 213K
'02 S420, 164K
'01 Prius 138K
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  #6  
Old 09-17-2006, 07:46 PM
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Why mess with a good thing

No need to bypass; 15 minute job. Remove all the hoses, 2 small bolts remove the cannister. Disassemble and replace the o-ring on the intake side; reassemble, reinstall and drive on.

Jim
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  #7  
Old 09-17-2006, 10:12 PM
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I can fix it with a standard O ring?
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'07 E320 Bluetec 133K my DD
'04 Jaguar XJ8 VDP, 34K
'10 Hyundai Accent 60K Grocery Getter
'02 VW Golf soon to be on the road again
'97 E300 Diesel Son's DD
'61 VERY tolerant wife

Hampton Roads, VA USA

Gone but not forgotten:
'67 250S 95K
'86 300SDL
'87 300D Turbo, 364K! R.I.P.
'98 E300 Turbodiesel, 213K
'02 S420, 164K
'01 Prius 138K
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  #8  
Old 09-18-2006, 09:21 AM
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Unless you plan on using Biodiesel. If that's the case you wouldn't want to use O-rings made of Nitrile.
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  #9  
Old 10-17-2006, 04:02 PM
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Can anyone help with the size of the o ring and where to find one? I am having the same problem and live in Minnesota so it is necessary.

thanks
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  #10  
Old 01-06-2009, 05:02 AM
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Can someone show me a picture? is it this thing they are taking about leaking in the pic i attached?
Attached Thumbnails
FUEL LEAK! Please help me identify-603.96x_pump01_left.jpg  
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  #11  
Old 01-06-2009, 12:36 PM
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Quote:
Originally Posted by muleears View Post
I can fix it with a standard O ring?
i bet a metric one will fit better.

DK- that is the lift pump.
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  #12  
Old 01-06-2009, 12:44 PM
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Quote:
Originally Posted by Dieselkraut23 View Post
Can someone show me a picture? is it this thing they are taking about leaking in the pic i attached?
The Fuel Heater is not on the IP. Where it is was described at the start of the Thread;"is immediately downstream from the primary fuel filter".
Start with the Primary/palastic filter on your Fuel Inlet Hose and work your way back towards the tank until you find the Fuel Heater "canister".
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  #13  
Old 01-06-2009, 01:21 PM
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The fuel thermostat in most cases is attached to the left side engine mount arm. In some early 87 300Ds it's bolted to the block ahead of the engine mount arm.

The dealer sells the o-ring which is what usually fails causing leaks.

Sixto
87 300D
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  #14  
Old 09-18-2010, 03:27 PM
mommamia
 
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How does one bypass this thing?
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  #15  
Old 09-18-2010, 03:34 PM
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Go from the small filter directly to the lift pump. The lift pump has two fittings - one is a rubber hose with clamp from the fuel thermostat, the other is a plastic line with a crimped threaded fitting (or is it a banjo fitting?). The fitting with the rubber hose and clamp is the input. That's the one you're after.

Sixto
87 300D

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