CP4 Thread - Dodge Cummins Diesel Forum
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post #1 of 227 (permalink) Old 08-03-2019, 07:46 PM Thread Starter
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CP4 Thread

Saw this but wanted to start a thread for the interested folks.

First of all I donít think there will be a recall
Second I was under the impression that the fuel pumps had inline filtration AFTER the pump to assist if there was s failure
Third - how would a failed system justify a new engine? Ford and GM have two fuel rails and two more injectors and never* had an engine replacement


1400 miles strong but apparently Iím close to a failure


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post #2 of 227 (permalink) Old 08-03-2019, 08:03 PM
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Nice to see Chrysler sent them a brand, new Cummings......

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post #3 of 227 (permalink) Old 08-03-2019, 08:08 PM Thread Starter
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Originally Posted by gsbrockman View Post
Nice to see Chrysler sent them a brand, new Cummings......


Iím glad you noticed that too haha


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post #4 of 227 (permalink) Old 08-03-2019, 09:00 PM
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There is no filter between the cp4 and the rail.
When the cp4 goes it take the injectors with it. I've not heard of needing a new engine but a whole new fuel system. I suppose if there is catastrophic failure it could take out some pistons. Entire engine seams iffy though.
Going to geuss that is a troll picture or something of the sort.
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post #5 of 227 (permalink) Old 08-03-2019, 09:10 PM Thread Starter
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There is no filter between the cp4 and the rail.
When the cp4 goes it take the injectors with it. I've not heard of needing a new engine but a whole new fuel system. I suppose if there is catastrophic failure it could take out some pistons. Entire engine seams iffy though.
Going to geuss that is a troll picture or something of the sort.


Similar to what I thought.

My understanding on the filter was more of a screen. Similar to this
https://www.wcfab.com/i-31420523-exe...fca-mprop.html

My mistake in calling it a filter


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post #6 of 227 (permalink) Old 08-03-2019, 09:31 PM
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Man I dont know how much I'd trust 25micron to save some injectors.

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post #7 of 227 (permalink) Old 08-03-2019, 09:34 PM Thread Starter
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Man I dont know how much I'd trust 25micron to save some injectors.

Considering it peaks at over 29,000 PSI I tend to agree with you.


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post #8 of 227 (permalink) Old 08-03-2019, 10:01 PM
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I don't understand why Cummins went with the CP4(I know they needed higher pressure/fuel delivery for higher torque). GM stopped using it and Ford has lawsuits over that pump, all because it comes apart internally and takes out the entire EFI system. Ford usually blames it on contaminated fuel, and denies the warranty. I'm glad I have the CP3.
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post #9 of 227 (permalink) Old 08-04-2019, 01:28 PM
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Originally Posted by Timberwolf2020 View Post
I don't understand why Cummins went with the CP4(I know they needed higher pressure/fuel delivery for higher torque). GM stopped using it and Ford has lawsuits over that pump, all because it comes apart internally and takes out the entire EFI system. Ford usually blames it on contaminated fuel, and denies the warranty. I'm glad I have the CP3.
If I am not mistaken the current class action for the CP4 (CP4.2) includes Ford, GM, FCA and Bosch as defendants. I am not sure why Cummins/FCA would have gone with the Bosch CP4 when there are other options out there (Denso?) and there is current pending litigation with that pump and higher than average known failures on the EcoDiesel with that pump.
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post #10 of 227 (permalink) Old 08-04-2019, 02:23 PM Thread Starter
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I bet it has everything to do with cost. Litigations or not if they can make 500,000 trucks and it costs $200/truck they will follow the money.

EPA is getting tighter and tighter with restrictions not allowing for any really R&D to take place to help consumers because they donít care about consumers. Manufactures are left with systems that are out there already.

Yes Denso pumps are available but we have to remember these trucks and the way the new integration has been working has been in the works for YEARS. Likely before the lawsuits and consistent trend of garbage pumps.

I donít expect a recall or pump replacement even though it would in the long run likely save them millions.

In general they will likely come to find out itís a problem child OR they may not. CP3s failed (arguably not as much as the yeas if CP4) but this could be trolling or it could be fake or it could be real when it comes to reports.

All we can do is run quality fuel, additives and report here if anything happens. (Even if the fuel and additives have proven ineffective before as pumps still fail)




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post #11 of 227 (permalink) Old 08-04-2019, 04:26 PM
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that's funny this came up I'm waiting on a factory order as we speak and found out after the fact that fca was dumb enough to use the cp4.2 in the 19's I'm actually second thinking on going through with it there's 2 class action suites going on because of this pump (GM and Ford) don't know if anybody actually read it but basically those pumps were not designed to run on ulsd we have in the states because it relise soly on the fuel to lubricate it it was designed for europe so by running ulsd through it it eats itself kinda like trying to run 3in1 oil in a car engine and both ford and gm supposedly were aware of this and rolled the dice anyway on top of that more so ford but also gm have been denying warranty claims based on blaming people for running contaminated fuel i know of one ford owner that shoved it right down their throats they pulled that on him he imediatly stopped the service writer said take me to my truck now give me the keys as soon as he had control of the vehicle he asked for the lab report documentation of the said contaminates and they could not produce it which they never can it's a baseless claim he then had his own test done by a third party and fuel test came back clean. A second ford owner same thing but he took them at their word and tried to get it covered by his insurance and go after the fuel station insurance company sent someone out to pull samples and guess what came back clean. maybe I'm just being paronoid but I'd rather not get stuck with a 10k bill on something that should be warrantied well maybe a little less than 10k for a cummins being that there's not 2 rails and 8 injectors

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post #12 of 227 (permalink) Old 08-04-2019, 04:37 PM Thread Starter
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I agree but letís be honest on one thing.

Itís not going to be 10,000.00
Those are V8 numbers that have two banks of high pressure fuel rails and two additional injectors not to mention all the garbage in the way to get to them.

You can buy CP4 pumps for $1300-1500 single fuel lines for cheaper than two and 6 injectors vs 8.

I would expect a DIY to be in the range of 4-5000 high end and paying someone could touch $6-7000

Donít look at the Duramax and certainly not the powerstroke numbers for repair cost estimates


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