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Discussion Starter #1
I have smelled a little diesel smell around the injection pump in my 2002 GMC Duramax with 23k. I have eliminated the fuel rails and the injectors. Am wondering if anyone has had a leaking pump or fitting in this area. I don't have the shop manual yet to see what down there and haven't started the removal of the parts in the way to diagnose before going in for Warranty service. Any help would be great.





Thanks





Dale
 

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Discussion Starter #2
BTW oil in crankcase is not contaminated with diesel. Just a smell for now and none dripping on the ground.





Dale
 

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Dale,
Is the odor very strong? Can you only smell it when you’re up close with the hood open or is it strong enough to be noticeable when standing several feet from the truck? I occasionally (not always) get a faint whiff of Diesel odor from my truck if I get up close and sniff near the grill, driver’s side wheel-well or near the engine. I have triple checked for leaks and not found any. I attribute the smell I detect to fuel spilled during filter changes and bleeding. Diesel fuel is oil and it takes a along time for it to completely dissipate. I ALWAYS can smell diesel under the truck near the fuel filler from small amounts of spilled fuel. It’s been my experience with the diesels I have owned that there always seems to be a faint diesel odor around the engine. However, if your smell persists and/or is strong, there could be a leak especially with the Duramax running at 23k psi fuel pressure.
Here are a few links that discuss the same question.
Smell fuel after filter install
Need Your Help
">Hey Professional Dmax Technicians and other Diesel-heads
Hope this helps..
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Is it distinctly a diesel fuel smell or a general oil smell? The crankcase oil breather hose is right at the bottom front. If you look from underneath it's right by the fan.


This could be an oil smell from from vapors from the crankcase.
 

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Another thought…
Could the faint diesel odor some of us notice in the passenger side wheel-well and grill be coming from the air cleaner inlet? I only seem to notice the diesel smell when the engine is hot. Maybe it’s just a little un-burnt fuel vapor coming back through the air cleaner (??).
 

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DieselDale said:
BTW oil in crankcase is not contaminated with diesel. Just a smell for now and none dripping on the ground.

This is a very interesting topic.


I too, have had this very thing, and I didn't notice it until about 3 weeks ago, and mine does NOT do it after the truck is "hot". In fact, it won't get "hot" here at all now because it's winter, and cold.


But, I have noticed sometimes, NOT always, when I park the truck in the garage that it smells like diesel fuel, NOT oil. I do NOT have any leaking on the ground either. It's been about 5000 miles since I had my fuel filter changed, and I did NOT notice after I had it changed, so I don't think that it's coming from the filter area.


Someone talked about all diesels smelling. My '95 Dodge NEVER smelled like diesel, UNTIL the return line busted, and then it was literally DUMPING fuel on the ground...


CADman_ksEdited by: CADman_ks
 

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My pump started leaking after I had the truck 4 weeks. Fuel would puddle up on engine till I was on an incline, then would drain off. Took dealer 1 day to agree it was leaking.


I can still smell diesel every now and then in the garage. All the friends I have say it is normal on their diesels too, no matter what brand.
 

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2002dura said:
My pump started leaking after I had the truck 4 weeks. Fuel would puddle up on engine till I was on an incline, then would drain off. Took dealer 1 day to agree it was leaking.


I can still smell diesel every now and then in the garage. All the friends I have say it is normal on their diesels too, no matter what brand.

2002dura,


Could you ever actually see it puddling on top of the engine?, and if so, where did you see it?


I love the smell of diesel fuel (as long as it's not on me), but I could never smell it OUTSIDE of the truck in my Dodge like I can with this truck. That's what makes me think that it's leaking somewhere. I COULD smell a faint diesel smell when I opened the hood, but not when I was standing beside it.


Mine was so bad one day that I looked under the truck just to make sure that it wasn't spilling somewhere. My WHOLE 3 car garage smelled like diesel fuel.


cadman_ks
 

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cadman_ks
Mine is never strong enough to notice in the garage like you are describing. Edited by: jbplock
 

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CADman_ks,


I could not see the puddle. When mine was leaking, on a flat surface I didn't notice. But when on a incline the build up would then pour off, the reason I said it was "puddling". When I took to dealer, they let it run for some time on a flat area and said it wasn't leaking, but then moved truck and then they saw it was leaking. It never showed signs of leaking in my garage, but I did notice spots on my drive way afterwards. I did notice the diesel smell more at this time. So did my wife, as she said it smelled up the whole house.


As for smell now, I hardly notice it but every now and then. If the smell is overpowering like it sounds like you are saying, I would have it looked at. Just make sure it is a certified D-Max mechanic that looks at it.
 

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When I install the engine mounted Racors I have to take the line off the fuel pump. A little fuel runs out the hose, down on the engine and down to the floor. You can check this area for leaks by removing the air intake tube to the turbo. Later! Frank
 
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