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  #1  
Old 02-04-2005, 06:56 PM
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massive fuel leak '86 300SDL

See attached picture, suddenly from the top of the fuel distributor, I'm losing at least a tablespoon a minute? Any ideas? Everything seems tight?












'86 300SDL 202,000
'91 560SEL 88,000
'94 SL500 22,800
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massive fuel leak '86 300SDL-pict0458.jpg  
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  #2  
Old 02-04-2005, 08:00 PM
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I'd have to see more than that. The pic is actually the top of the fuel injection pump. I would be surprised if it "suddenly" started coming from the tubing fittings that are shown. You need to look deeper in there and try to ascertain exactly where it is coming from.
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  #3  
Old 02-04-2005, 08:42 PM
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How does it run...rough, normal or what? Are the fuel return lines (between the injectors) in good shape? Is there any fuel leakage evident near the injectors themselves? Need more info to help ya.
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  #4  
Old 02-04-2005, 09:18 PM
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Spray some brake cleaner or something alike, to clean that pump up. Then start the engine and see where exactly it is leaking from. Diesel is really a thin oil, and like oil, spreads. So you could have small leak that spread.
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  #5  
Old 02-04-2005, 09:28 PM
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There was some minor leakage from the fuel return lines, so I replaced all of them. The wet areas surrounding the fuel injectors are now dry. Vehicle runs and operates normally. I will clean up the area tommorrow and see if I can see where the flood of fuel is coming from, it really is a huge leak, the side of the engine is saturated with fuel.
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'94 SL5000 60,000
'91 350SDL 545,000
'91 350SD 197,000
'00 E55 AMG 77,000
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  #6  
Old 02-05-2005, 09:12 AM
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If anything, look at it as a rust preventing measure for your engine block. All kidding aside, that mess looks worse than it probably is. Here is the upshot to a diesel leak, no chance of an explosion/fire like it would be with gas.
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  #7  
Old 02-05-2005, 09:41 AM
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in all probablity the injector lines have cracked at the junction. Common on the 602/603 engines which have (relative to the 617 motors) flimsy fuel lines.
This is probably a result of bad motor mounts
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  #8  
Old 02-05-2005, 01:28 PM
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I cleaned the entire area, and dried it. Inspected the fuel lines they appear to be fine no leakage at all. I start the car and within a second going from left to right 1, 3 and 5, are saturated (see attached new picture), and pouring huge amounts of fuel. I checked exiting fuel lines and they are dry, just the wet areas in the photo are soaked. The only thing keeping this from being a major fire hazard is the fact that fuel delivery is on the drivers side and the exhaust is on the passenger side.
Attached Thumbnails
massive fuel leak '86 300SDL-pict0466.jpg  
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'94 SL5000 60,000
'91 350SDL 545,000
'91 350SD 197,000
'00 E55 AMG 77,000
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  #9  
Old 02-05-2005, 01:41 PM
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Could possibly be one or more bad delivery valve seals too.....
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  #10  
Old 02-07-2005, 07:34 PM
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It doesn't matter any more what was leaking. Apparently at highway speeds the fuel leak was adequate to travel to the exhaust where it resulted in a massive fire, there's nothing left to the car, even the tires were reduced to ash in minutes. It's just a cooked piece of metal. Thanks anyway.
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'91 350SDL 545,000
'91 350SD 197,000
'00 E55 AMG 77,000
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  #11  
Old 02-07-2005, 08:06 PM
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This is one of those posts that you read and are simply too shocked to respond.

I realize that nothing can make you feel any better about the situation but, I trust that nobody was injured, which is the most important thing.

I never would have believed that a leak that you described could be severe enough to reach the exhaust.

My heartfelt condolonces on the loss of the vehicle.
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  #12  
Old 02-07-2005, 08:14 PM
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good God! I feel badly, this is cause for a wake.
I would never have guessed the words massive were indeed massive, but that must have been a realistic choice of words, in which case you should have - - - Oh forget it it a lesson for the rest of us.
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  #13  
Old 02-07-2005, 09:29 PM
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Smile Injector leak

I have replaced the o-rings (seals) on the above. Not a hard thing to do. It solved the proble. Here in CA we have a low sufler fuel and it does not work with older seals. Change them and I bet your problem is solved.
R. Ragno
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  #14  
Old 02-07-2005, 11:02 PM
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But Ron, read the thread, man! His car is history!!!!!
I sure hope insurance covers it!
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  #15  
Old 02-08-2005, 09:43 AM
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Man, I really feel bad. I know you don't want to ehar this but the o-rings and seals that need replaced on your acr are under $9.

David
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