New CP4 - Dodge Cummins Diesel Forum
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post #1 of 41 (permalink) Old 07-02-2019, 09:11 AM Thread Starter
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New CP4

New to this forum...currently own a 2011 Duramax that I had to replace the Bosch CP4 on. It's for sale now and am buying a Ram in the next 2 wks. Im wanting a 19' but it looks like I'm gonna have to stick to an 18' after the run around I'm getting on answers to the 19s new fuel pump! I simply asked for any information as to if the Bosch CP4 now implemented by Cummins has been updated at all, or if they're the same pumps failing in GM and Ford. Thought I'd share...

First I contacted Cummins since they are the ones that put the Bosch pump on their motor. "We have a legal agreement with Ram and cannot disclose any information on regarding this motor. Need to contact Ram"

At the same time Bosch responded with the SAME answer as Cummins.

I then contacted Ram and they opened up a "case" to my question lol. After a week I got this..."I reached out to my technicians and also Bosch and this is the only information I have for you...'We cannot disclose this information as we have a legal agreement with Ram'. Let us know if there is anything else we can help you with."

Uh...you are Ram you frickin moron! Basically none of them want to touch on this and it doesn't sound promising. I would think that if the pumps have been updated, Ram would be happy to tell us as a selling point. Ridiculous.

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post #2 of 41 (permalink) Old 07-02-2019, 09:39 AM
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Probably thousands of these new RAMs out their now doing hard labor dragging loads across the country. Nobody has reported an issue. Mine hasn't finished its first tank of diesel yet, so I can't comment personally on long term, but as of now, 0 issues.
And it's actually a CP4.2 pump, so one could speculate there was a revision/upgrade. And yes, the new CP4.2 pump was one of the many new features highlighted at the auto shows and press releases.

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post #3 of 41 (permalink) Old 07-02-2019, 07:11 PM
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Good question as the CP4.2 is supposedly just a variation of the basic CP.4. When it goes the entire fuel system goes as pieces foul everything. The old CP3 was "bullet-proof".

One thing to consider is always keeping fuel pressure into that pump. When changing filters, think they designed new ones for the 2019, be sure to prime properly. The CP4's are not tolerant of being run dry like the CP3.

You are not alone. Many feel that change is a serious mistake for reliability in the long term.
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post #4 of 41 (permalink) Old 07-02-2019, 07:11 PM Thread Starter
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Well my 2011 Duramax NOW has a CP4.2 which is what they replaced the old one with. But the 2015-16s came with the CP4.2 and they are failing as well. That's why GM ditched them all together in 2017. We'll see I guess. I'd be less worried if there were even more revisions made and info given.
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post #5 of 41 (permalink) Old 07-02-2019, 08:32 PM
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They have always been CP4.2. The .2 doesn't mean revision, it means it is a two piston pump. Even the revised pumps after 2015 still had issues... I wouldn't buy one with other excellent options available.

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post #6 of 41 (permalink) Old 07-02-2019, 08:35 PM
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No issues with my 2019 Ram 3500 or my two Ecodiesel's a 2014 Grand Cherokee and a 2018 Ram 1500 both with CP4's.
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post #7 of 41 (permalink) Old 07-02-2019, 09:22 PM
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A Duramax also has no lift pump. So.....

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post #8 of 41 (permalink) Old 07-03-2019, 12:36 AM
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my former 2016 ecodiesel had less than 22000 miles this year when my fuel system took a dump. Tech blamed bad fuel, resulting in cp4 failure and requiring complete fuel system replacement. Blaming fuel issues, no warranty coverage and 7K bill. Strangely I filled up my 13 2500 within 4 hours at the same exact pump to resume a planned 3 hour way trip with no issues, so I am a wee bit skeptical of the techs findings...

I would like to replace my 13 with a new truck but the cp4 potential issue has me on hold for now.

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post #9 of 41 (permalink) Old 07-03-2019, 10:35 AM Thread Starter
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Quote:
Originally Posted by Boostin_AWD View Post
A Duramax also has no lift pump. So.....
Lift pumps help, but what is Fords excuse? The problem is the fuel here in the U.S. Our diesel #2 has no lubrication in it and these pumps were designed to be lubricated by the diesel. Other countries have diesel #1 and these CP4s are running just fine. The lift pumps help but will not prevent. Nice try, so.....

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post #10 of 41 (permalink) Old 07-03-2019, 10:41 AM Thread Starter
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Originally Posted by Cummins pig View Post
They have always been CP4.2. The .2 doesn't mean revision, it means it is a two piston pump. Even the revised pumps after 2015 still had issues... I wouldn't buy one with other excellent options available.
I understand the 2 pistons...what other excellent options are you talking about? 2018 Cummins?
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post #11 of 41 (permalink) Old 07-03-2019, 12:24 PM
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Quote:
Originally Posted by bert1 View Post
my former 2016 ecodiesel had less than 22000 miles this year when my fuel system took a dump. Tech blamed bad fuel, resulting in cp4 failure and requiring complete fuel system replacement. Blaming fuel issues, no warranty coverage and 7K bill. Strangely I filled up my 13 2500 within 4 hours at the same exact pump to resume a planned 3 hour way trip with no issues, so I am a wee bit skeptical of the techs findings...

I would like to replace my 13 with a new truck but the cp4 potential issue has me on hold for now.
I hear Ford likes to say the same thing. I am curious if anyone has pushed the issue... i.e. What contaminate? What percentage of contamination or ppm contamination? Why did the factory filter/separator not prevent it? Is there a flaw in the factory filters?

I get your barking against the corporate tree (deep pockets for lawyers), but if they are going to claim contamination then it would logically assume they tested something to find out it was contaminated. Otherwise its a baseless claim.


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post #12 of 41 (permalink) Old 07-03-2019, 12:47 PM Thread Starter
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Quote:
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Quote:
Originally Posted by bert1 View Post
my former 2016 ecodiesel had less than 22000 miles this year when my fuel system took a dump. Tech blamed bad fuel, resulting in cp4 failure and requiring complete fuel system replacement. Blaming fuel issues, no warranty coverage and 7K bill. Strangely I filled up my 13 2500 within 4 hours at the same exact pump to resume a planned 3 hour way trip with no issues, so I am a wee bit skeptical of the techs findings...

I would like to replace my 13 with a new truck but the cp4 potential issue has me on hold for now.
I hear Ford likes to say the same thing. I am curious if anyone has pushed the issue... i.e. What contaminate? What percentage of contamination or ppm contamination? Why did the factory filter/separator not prevent it? Is there a flaw in the factory filters?

I get your barking against the corporate tree (deep pockets for lawyers), but if they are going to claim contamination then it would logically assume they tested something to find out it was contaminated. Otherwise its a baseless claim.
I tried to get my insurance to cover it so they had a 3rd party take a fuel sample and it came back clean. Yet GM claims it is only due to fuel contamination/water. Neither will help me. I did join a class action suit against GM where they are claiming the same thing but who knows where that will go. Lawyers say the case is very strong...🤦‍♂️
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