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Duramax Fifth Generation: 2011-2016 (LML) Discuss the fifth generation (2011-2016) of the 6.6L Duramax diesel engine & associated components. Engine related discussion ONLY.

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Old 12-20-2015, 09:01 PM   #1 (permalink)
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CP4 and Contaminated / Misfuel Issues - Thoughts

1509-understanding-modifying-high-pressure-fuel-pumps-for-cummins-duramax-and-power-stroke-engines/

Google Link to Government CP4 Failure Analysis on CP4 Fuel Pumps

So the 1st link is to TruckTrend to get a CP3 vs CP4 primer.......and the 2nd link is to a government report on CP4 failures on Volkswagon TDI engines.


Looks like to me the CP4's biggest enemy is fuel contamination (whether user misfuel or tanker / storage tank contamination with water or gasoline).

I am surprised that GM doesn't have an in-line strainer on the Duramax for metal shavings like VW does if the CP4 let's go....but then again, maybe it is moot as small metal shavings are getting downstream anyways....negating the in-line strainer.

So to those of you who have had your CP4's replaced (under warranty or not) was there any discussions regarding contaminated fuel when you had the pump and injectors replaced? Also, do you guys tend to run your tanks down to empty a lot? Or keep them 1/2 full at least before refueling.

Dunno if it makes a difference or not running the tank down, but if the fuel filter can't actually separate water contamination....well there's your problem.

If it's Gasoline or Kerosene getting into the mix, and screwing up the lubrication of the ULSD, then maybe there is some truth to adding a bit of 2-cycle oil to your fill-ups as "insurance".....or Power Service....or your preferred additive. But it seems like a waste of time if you have a good ULSD supply around.

Dunno....just thinking out loud here....


Last edited by 187058; 12-20-2015 at 09:06 PM.
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Old 12-20-2015, 09:07 PM   #2 (permalink)
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The delco/raccor filter is an excellent water filter.

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Old 12-20-2015, 09:16 PM   #3 (permalink)
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Well....forget the 2-Cycle oil....

2-Stroke Oil In Diesel ? A Technical Study
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Old 12-20-2015, 09:17 PM   #4 (permalink)
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Quote:
Originally Posted by redwngr View Post
The delco/raccor filter is an excellent water filter.
I thought so, but then you hear the aftermarket guys chime in how they don't work.....especially when you hear about CP4 failures.

Soooo....guys that had their CP4's swapped out....were you on the stock filter or something aftermarket?
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Old 12-20-2015, 09:42 PM   #5 (permalink)
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Quote:
Originally Posted by mdoerner View Post
I thought so, but then you hear the aftermarket guys chime in how they don't work.....especially when you hear about CP4 failures.

Soooo....guys that had their CP4's swapped out....were you on the stock filter or something aftermarket?
And stock tuning or upfuelled?
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Old 12-21-2015, 02:50 PM   #6 (permalink)
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Don't you need a CP3 and CP4 to do that?
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Old 12-22-2015, 08:55 AM   #7 (permalink)
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Quote:
Originally Posted by mdoerner View Post
Well....forget the 2-Cycle oil....

2-Stroke Oil In Diesel ? A Technical Study
I'm' glad you posted this link. I thought I was the only one that didn't like running 2 stroke in my truck. Around 185k miles on my factory injectors, I read the study on another site about adding 2 stroke oil in the fuel. Within 5-7k miles, my injectors went to crap. My thought, that many miles it was just a coincident. Got new injectors and didn't run 2 stroke for a while. Tried it again at about 260k miles and shortly after my CP3 died. I am not running 2 stroke again, it may have been coincidence but I am not taking any chances. I do run bio-diesel every chance that I can.

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Old 12-22-2015, 09:55 AM   #8 (permalink)
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"Looks like to me the CP4's biggest enemy is fuel contamination (whether user misfuel or tanker / storage tank contamination with water or gasoline)".
The biggest enemy of the Bosch CP4 is poor design and has very little to do with anything else. Sure, there are a few case of fuel related problems. These catastrophic failures came to head with the CP4 introduction in GM, Ford, and VW.
The auto manufacturers love to make the motoring public the scape goat and claim that they have induced water, and other problems.

The CP3 runs just fine doing the same job, with few premature failures and with the same folks driving the same engines and using the same fuel. We know that the our gov diesel standard is not the best but the manufacturers have signed off on it never the less.

At the present GM is footing the repair bills much better than Ford. I also think that GM has less failures or has less blow back in the news about it. When someone elects to toss the GM designed fuel filter for some other after market filter, it makes me wonder, as GM and Racor put a lot of engineering money into producing the best that can be made.
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Old 12-23-2015, 05:47 PM   #9 (permalink)
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While it's nice to say "The CP4 is a bad design" what other alternative is there to get to 30ksi on the fuel rail? While the CP4 may not be as fault tolerant as we'd like.....that doesn't make it a bad design.
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Old 12-23-2015, 05:50 PM   #10 (permalink)
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And here's more Bosch CP4 literature....or propoganda....depending on your point of view....

Milestones in Common Rail Development

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