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Old 03-15-2010, 11:35 AM   #1 (permalink)
suncoug
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2002 LB7 Fuel Leak

I have a 2002 GMC Sierra 3500 Dually with 4x4 Duramax LB7.

I was out of town over the weekend. While I was fueling, I heard what sounded like water gushing out from the truck. I looked below and it was actually diesel fuel coming down from the engine compartment. So, I stopped fuelling. Then, I started the motor and moved forward a bit, the fuel appeared to stop coming down once I started the motor. However, when I turned the motor off again, lots of diesel started coming down. Then, it stopped.

Since it was very late at night and I was still 100 miles from home, I kept driving since the motor was running fine and fuel stopped leaking as long as the motor was running.

I got home fine but the same thing happened when I turned off the motor after parking.

However, when I started the motor the next day to check out where the diesel was leaking, it stopped leaking. I drove around town but it did not leak at all. I went under the truck to see where it had been leaking but I could not tell. It certainly didn't look like it was coming from somewhere around fuel/water filter.

However, the fuel consumption was much much higher than usual and I could almost see the needle drop. I checked the oil, the level did not rise but I could smell diesel.

I took it to the dealer (Haley GMC of Richmond) this morning. Diesel was not leaking. However, I got a call from them saying that I need to take it to another dealer because they are not able to lift it because because my truck is to wide and long (it is crew cab dually with 8 ft bed).

I called the other dealer (Capital GMC) that the first dealer recommended but I was told that they can't lift it either. However, they are able to do everything on the floor. Also, the second dealer is too busy to take a look at my truck for anther several days.

I would like to get your thoughts. I have read other posts but what is happening to my truck seems to be a bit different than the usual injector issues. It currently has about 130,000 miles and is on a second set of injectors. I bought the truck 4-5 years ago Michigan, so some sort of fuel line corrosion could be an issue.

I would really appreciate your thoughts on this.
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Old 03-15-2010, 11:42 AM   #2 (permalink)
suncoug
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Also, as mentioned the motor is running fine with good power. I have not seen any usual smoke. It seems to be idling just a little rougher than usual.
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Old 03-16-2010, 08:50 AM   #3 (permalink)
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I have dropped the truck off at another dealer. I will report back on what they find.
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Old 03-16-2010, 07:30 PM   #4 (permalink)
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They are saying it is the injector that is causing this.
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Old 03-16-2010, 09:30 PM   #5 (permalink)
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had sumthing simular to urs. i jus got mine back today from dealer, they fixed an injector line an fuel rail,
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Old 03-16-2010, 11:16 PM   #6 (permalink)
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OK, thanks. It doesn't seem like symtoms jive with typical fuel injector issues. It is leaking a lot of diesel and I suspect something else like fuel pump or fuel line somewhere. I will speak to the diesel mechanic and find out more.
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Old 03-17-2010, 10:56 AM   #7 (permalink)
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Diesel mechanic says the crank case is full of diesel. I was quoted $5600 to replace the injectors. I am going to try to fix it myself.
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Old 03-17-2010, 05:55 PM   #8 (permalink)
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My dealer replaced mine half that price....
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Old 03-18-2010, 11:12 AM   #9 (permalink)
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Wow, I wish your dealer was close to Richmond, VA.

I picked up the truck last night. The oil pressure was low. I got home and drained the oil and it was mostly diesel. I put fresh Rotella T on it. I don't plan on using it until I take look at injectors.

I am just amazed how well the truck runs, idles with no smoke especially with crank case full of diesel.
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Old 03-18-2010, 03:48 PM   #10 (permalink)
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Could be the injector return lines and not the injectors. My return lines were leaking in mine. They are a pain in the a$$ to get to but a lot cheaper than injectors. I found this problem by running all the tests I could run with efi live and the injectors passed everything I threw at them. Replaced return lines and seals and no problems.
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