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#1
11-25-2008, 11:38 AM
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Diesel Leak, where to start.....
I parked my car for about two weeks with a drip pan under it to see if there was any leaking. It turns out that there was diesel fuel leaking of the lower AC hose. I am pretty sure that the AC hose is not filled with diesel, so it must be coming from somewhere higher up.
It is a small leak, but I would like to fix it. Since I am not really well skilled at this yet, any ideas where I should start looking? I tried tracing it and I could not find anything, but that is not really a shocker as I am not sure where to look. FWIW I did replace the return lines about a year ago - they were leaking. Any help would be appreciated.
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86 300 SDL - Vesuvius 96 SL 500 Assumption is the mother of all screw ups. Do not go gentle into that good night. Rage, rage against the dying of the light. - Dylan Thomas All that is necessary for the triumph of evil is that good men do nothing - Edmund Burke 
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#2
11-25-2008, 11:52 AM
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I would start with the primer pump and work my way out from there, filter (primary and secondary), then I would look at your supply and return lines to the IP, I don't know much about the year you have but hopefully this will help.
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#3
11-25-2008, 12:56 PM
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An 86 SDL doesn't have a separate primer pump. Priming is done by the lift pump with the help of the starter and usually costs a battery
 Follow the fuel path from the metal lines along the left inner fender to the small fuel filter to the fuel thermostat, up behing the oil filter to the fuel heater back to the fuel thermostat to the lift pump, then the plastic line to the big fuel filter, around the big bolt sticking down into the big fuel filter then back to the injection pump, then examine the where the injection lines connect to the injection pump, next check where the injection lines attach to the injectors as well as the return hoses that link the injectors. Work from back to front then to the fitting by the big fuel filter where the injector return line is joined by the injection pump return line then goes to a metal line on the inner fender. Start by cleaning everything described that's not presently clean and dry. I use brake parts cleaner. Observe for a couple of days what gets wet with fuel. Sixto 87 300D
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#4
11-25-2008, 06:34 PM
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my observation...
Just an FYI.
My 300SDL is leaking fuel and I am almost 100% sure I have nailed it down to coming out of the Injection Pump on either #3 or #4. These are the "parts" that the fuel lines screw onto. The connection between it and fuel line is NOT leaking, yet, fuel appears on TOP of the injection pump where the "fittings" come out. I catch about 8 drops with 6 hours. My bottom sound\rock guard pan is off.
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daw_two Germantown, TN Links: Sold last car --- 05/2012 1984 300D Light Ivory, Red interior No longer selling Cluster Needles Paint No longer selling New Old Stock (NOS) parts Past: 3/2008 1986 300SDL "Coda" 04/2010 1965 190D(c) "Ben" & many more
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#6
11-25-2008, 11:54 PM
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If you are not sure were a leak is; any leak; clean any area you think there is any possibility of a leak coming from until it is clean and dry. Run the vehicle awhile, shut it off,and look around with a strong light and morror; as well as running you hands over areas that are not to hot to touch until you find/feel the wet spot. At which point you will begin to have a good idea where you leak is coming from.
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84 300D, 82 Volvo 244Gl Diesel
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#8
11-26-2008, 08:08 PM
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The fuel and coolant are on either side of the injector cups. The only way I can think of oil getting through a cracked cup would be if an injector o-ring was also shot on the same cylinder as the cracked cup. That might allow fuel and oil to mix and then blow through the crack, but that should give you fuel and oil in the coolant.
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