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Chevrolet Silverado 2500: I have a 2002 duramax 2500 the crankcase…

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I have a 2002 duramax...
I have a 2002 duramax 2500 the crankcase keeps filling with diesel we just replaced the injectors and new injector lines what else would cause that?
Submitted: 3 years ago.Category: Chevy
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5/25/2015
Chevy Mechanic: BOBBYSS, Master Technician replied 3 years ago
BOBBYSS
BOBBYSS, Master Technician
Category: Chevy
Satisfied Customers: 17,588
Experience: ASE MASTER CERTIFIED, AA DEGREE AUTO/DIESEL TECH
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Hello, my name is***** for the question. If I am not online when you return please give me some time to get back to you. Can you tell me how much you need to drive it before it fills with fuel?
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Customer reply replied 3 years ago
I would say approx 250 miles and it fills up and oil pressure starts to drop again pretty fast fuel leak I would say! the truck dosent smoke like it did befor so the injectors fixed that issue but it still is filling the crankcase also no injector sleeves pulled out so we were lucky to not have to replace any of those
Chevy Mechanic: BOBBYSS, Master Technician replied 3 years ago
Thank you. If it is not smoking then most of the time this is caused by a compression issue. It may be on one or multiple cylinders. Due to how bad it was before, the oil being washed from the cylinders may have causes some damage to the walls and now you have a compression issue.
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Customer reply replied 3 years ago
The runs fine no issues a compression issue would cause smoke? Correct aren't we talking like a return line or something that may leak ?
Customer reply replied 3 years ago
And a compression problem wouldn't cause the crank case to fill?
Chevy Mechanic: BOBBYSS, Master Technician replied 3 years ago
Most of these parts would cause external leaks. If it is getting into the crank case then it is either due to too much fuel still coming from the injectors or it is not burning all of the fuel off. Is the check engine light coming on?
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Chevy Mechanic: BOBBYSS, Master Technician replied 3 years ago
When you pull the valve covers is there any sign of tracking on the head from fuel such as clean areas?
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Customer reply replied 3 years ago
I know there was no signs as far as I know when we remove the heads the only thing I can think of would be a high-pressure fuel line leaking but we put new ones in and also a return line with leak into the valve cover but I replaced the seals? Possibly a shaft seal on the high-pressure fuel pump Can I test the return lines? By using a vacuum pump
Chevy Mechanic: BOBBYSS, Master Technician replied 3 years ago
It is better to pressure test them than to do a vacuum test, but you can do it that way.
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Customer reply replied 3 years ago
So in your opinion what do you think? I honestly don't think it's compression because of how well the truck runs and how there is no smoke from it if there's any loss of compression usually diesel motors smoke
Chevy Mechanic: BOBBYSS, Master Technician replied 3 years ago
I don't think it is compression either at this point. It would not be running well if it was. I am suspecting a bad connection on one of the lines or a return line itself.
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Customer reply replied 3 years ago
What is needed to do the test on the return lines just a vacuum pump? And also if the high-pressure injector lines are leaking wouldn't it be coming out of the connection on the top of the valve cover ??
Chevy Mechanic: BOBBYSS, Master Technician replied 3 years ago
If a vacuum pump is what you have that will work. Pressurizing the lines is better, but that is much more expensive equipment. As for the pressure lines, they can leak on the injector side.
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Customer reply replied 3 years ago
Okay well I'm going to pull it apart test it and run it with the valve covers off to try to find the leak what do I can add to the fuel?
Customer reply replied 3 years ago
Okay so today I pressurize the entire return system and I can hear some air blowing out of the return fittings that should be a problem correct we're going to get new return lines and seals how long should the system hold pressure for?
Chevy Mechanic: BOBBYSS, Master Technician replied 3 years ago
If there is air coming from the fittings then that is more than likely the issue. I usually add some soap to it so I can see the bubbles. You should be fine after replacing those though. Let me know if you need more help.
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Customer reply replied 3 years ago
Ok we replaced the lines and seals it no longer leaks it held 15 psi and put it back together I really hope it dosent leak but if it does its the highpressure fuel pump how often do you see that??
Chevy Mechanic: BOBBYSS, Master Technician replied 3 years ago
I do not see the high pressure pump fail very often on this engine other than losing pressure. Rarely if ever an external leak. I hope this takes care of it. If you need anything else please let me know.
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