Duramax High Pressure Injector Pump failure

[outrider]

I have recently heard some horror stories about high pressure injector pumps self destroying in 2011, 12 and 13 Duramax trucks with metal going throughout the rails and even into the injectors. If fact, dealers in Maine, Arkansas and Florida all state that this is a common problem after 100,000 miles. A diesel specialty shop in Arkansas stated that it has only occurred since the advent of DEF.

Do any of you have opinions or have any of you heard of this problem?

[jsmith948]

I can't speak to problems regarding the Isuzu engines. If the FUELpump self destructs, I suppose it would be possible to have metal debris reach the injectors. However, I believe the statement by the Arkansas shop suggesting that these pump failures are somehow due to the advent of use of DEF has me a bit confused. On our 6.7 L Ford, The DEF is injected into the exhaust downstream of the turbo by a different pump. I do not believe there can be a connection - JMHO:)

[X-Treme]

On our 6.7 L Ford, The DEF is injected into the exhaust downstream of the turbo by a different pump. I do not believe there can be a connection - JMHO:)

Same thing on the duramax.

[Quad]

I can't speak on the LML engines as I haven't worked on one and I do not own one. I understand they are a CP4 Injection pump and also no nothing about them. But the earlier version, the CP3 injection pump had none of these problems you are concerned with, and the CP4 pump is most likely still the same piston pump with updates and higher pressure for the piezo controlled injectors. I also understand, but am not really familiar with DEF. But the old way of doing it with a DPF was to inject diesel fluid via an injector in the exhaust system to burn the exhaust matter to clean it. If that follows true (and I don't see it being that different) then DEF is injected in the same manor and burned in the same manor as the old system that burnt diesel fluid in the exhaust. Again I could be wrong, I'm not "up" and as heavily "in" as I use to be in the diesel world. But I haven't seen or heard those issue your hearing.


2005 Silverado 2500HD D/A
2013 Laredo 321BH

[Jim W]

I have recently heard some horror stories about high pressure injector pumps self destroying in 2011, 12 and 13 Duramax trucks with metal going throughout the rails and even into the injectors. If fact, dealers in Maine, Arkansas and Florida all state that this is a common problem after 100,000 miles. A diesel specialty shop in Arkansas stated that it has only occurred since the advent of DEF.

Do any of you have opinions or have any of you heard of this problem?

You have what is known as a CP4 pump which VW uses too. These pumps should run for 200,000 or 300,000 miles before you will need to replace them. What causes them to fail early is fuel quality (water, air or gas) or a secondary issue. If you are really concerned about your CP4 pump I would use and additional fuel filters for the fuel system such as an AIR DOG system.

VW has experience some pump failures in their diesel engines most of these failures have been attribute to water or gas in the fuel system. VW has issued stickers and an additional fuel guard in the filler neck to insure only diesel fuel is used. My wife’s Jetta which is a 2011 model has had the recalls which have been done to it; so that is why I am familiar with this issue.

I am using a Glacier Diesel Big Line kit which is an absolute 5 micron, 2micron secondary filter which is after the stock filter but a head of the CP3 pump. On my engine which is the 6.7L Cummins to protect the CP3 fuel pump.

Jim W.

[Quad]

You know in thinking about it further, the only way (other than bad design) I can see an issue with these is if being a pump made for higher pressures is would have lower volume than a CP3, and if the ULSD fuel didn't have enough lube for the pump. Though you would think Bosch would have that added to their thoughts when building the CP4.


2005 Silverado 2500HD D/A
2013 Laredo 321BH

[outrider]

DOn't know about the DEF! With that said, maybe it is just the thought of having to add DEF. I do know that the motor was the LML and that is what the dealers talked about, not the older engines. The dollar figures discussed were from 5500 up to 9500 dollars if metal was in the rails. My truck IS the 2012 LML, that is my concern. The comments about the extra filtration seems like a good preventative maintenance move.

[Jim W]

Def (urea) has nothing to do with the fuel system. Def is injected into the exhaust system for emissions on the truck. Now if someone put Def in the fuel system by mistake this will cause issue with the pump and injectors since Def is made with distiller water and ammonia. I hope this was not the case but I don't know if GMC/Chevy is using Def in the 2012 trucks.

Jim W.

[DirtyOil]

the CP4.2 high pressure fuel pump is used by GM, Ford, VW and Audi. Failures are due to first production runs where QC was the issue and not the fuel quality, GM, VW and Audi have been replacing these pumps on warranty where Ford hasn't been in many cases of the failures. Several posts on many different forums have the horror stories, costs of $10,000 to $12,000+ for replacement(including labour). If you own a GM diesel with CP4.2 fuel pump, you'll most likely be covered by warranty.




:CF:

[Quad]

There you go, easy enough answer and solution.


2005 Silverado 2500HD D/A
2013 Laredo 321BH