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#1
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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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Muleears '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 |
#2
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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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'87 300SDL, intensely modified Greasecar setup, with nickle plated heat exchanger, 3 valve setup, 312,000 miles '95 Suburban diesel, Greasecar basics, 16 plate heat exchanger, mercedes fuel lines, Racor filter '85 Renault Alliance converted full electric vehicle |
#3
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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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Muleears '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 |
#4
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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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87 300D - Running on Veggie oil; 260,000 plus miles; Original #14 head |
#5
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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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Muleears '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 |
#6
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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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2005 C240 4matic wagon (daily driver) 87 190D - 225K (on loan) 85 190D - 312K (on loan) 2011 Subaru Legacy AWD (Wife's) |
#7
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I can fix it with a standard O ring?
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Muleears '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 |
#8
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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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'87 300SDL, intensely modified Greasecar setup, with nickle plated heat exchanger, 3 valve setup, 312,000 miles '95 Suburban diesel, Greasecar basics, 16 plate heat exchanger, mercedes fuel lines, Racor filter '85 Renault Alliance converted full electric vehicle |
#9
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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 |
#10
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Can someone show me a picture? is it this thing they are taking about leaking in the pic i attached?
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Wie lange wird Ihr Auto leben? |
#11
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i bet a metric one will fit better.
DK- that is the lift pump.
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1984 123.193 372,xxx miles, room for Seven. 1999 Dodge Durango Cummins 4BTAA 47RE 5k lb 4x4 getting 25+mpgs, room for Seven. |
#12
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Quote:
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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84 300D, 82 Volvo 244Gl Diesel |
#13
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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 |
#14
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How does one bypass this thing?
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1995 E420 152k 1991 300D 2.5 348116 daily driver 1992 300E 2.6 196k-work in progress(head gasket) 2002 BMW 745Li 93k |
#15
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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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