CP4 Implosion!!! CRAP! CRAP! CRAP!
According to vid in this thread, anyway.
https://www.ford-trucks.com/forums/1...l#post20925805
I picked it up about 10:45 am. I then ran the truck hard for the last 2 hours. It appears to be running well. (I didn't go pull my trailer but will probably do that over the weekend). I checked under the hood and underneath for any leaks, etc and it looks clean.
The truck was less than quarter full so I filled up (44 gallons) and added in Hotshot's Secrets Everyday Diesel Treatment (EDT). I was previously running the Ford PM-22A but after a bunch of research have decided to switch to Hotshot's EDT. It probably makes little difference but it makes me feel better so there is that. :-)
I greatly appreciate everyone's support and advice during this ordeal. Hopefully, this is all behind me and I can drive my truck another couple of years. When it comes time to trade, I am not sure what I will do. I have a strong aversion to purchasing another Ford Diesel if it has the CP4. FORD CORPORATE - ARE YOU HEARING ME? (probably not but again saying it makes me feel better)
Thanks again fellers - this forum has been an invaluable resource to me for many years and I greatly appreciate it.
Happy Friday!
According to vid in this thread, anyway.
https://www.ford-trucks.com/forums/1...l#post20925805
S&S touched on this increased displacement in one of their videos. At the time if that video they had not tore a '23 CP4 apart, and was questioning if that increased displacement was accomplished by only increasing the stroke. In his opinion, that would be a pretty long stroke for a pump that's expected to live very long. Hopefully they will do a future video with more details on the newest CP4 that Ford is using.
I picked it up about 10:45 am. I then ran the truck hard for the last 2 hours. It appears to be running well. (I didn't go pull my trailer but will probably do that over the weekend). I checked under the hood and underneath for any leaks, etc and it looks clean.
The truck was less than quarter full so I filled up (44 gallons) and added in Hotshot's Secrets Everyday Diesel Treatment (EDT). I was previously running the Ford PM-22A but after a bunch of research have decided to switch to Hotshot's EDT. It probably makes little difference but it makes me feel better so there is that. :-)
I greatly appreciate everyone's support and advice during this ordeal. Hopefully, this is all behind me and I can drive my truck another couple of years. When it comes time to trade, I am not sure what I will do. I have a strong aversion to purchasing another Ford Diesel if it has the CP4. FORD CORPORATE - ARE YOU HEARING ME? (probably not but again saying it makes me feel better)
Thanks again fellers - this forum has been an invaluable resource to me for many years and I greatly appreciate it.
Happy Friday!
Glad to hear this.
Hoping mine will be done by end of next week.
Get yourself a fuel filter kit ordered if you don't already have one, and change that filter set after your upcoming trip just for the added protection.
Any suggestions on best place to order the filter kit?
Regards!
Last I bought on amazon still aren't too bad, and are oem motorcraft>
Ford Trucks for Ford Truck Enthusiasts
Last I bought on amazon still aren't too bad, and are oem motorcraft> https://www.amazon.com/gp/product/B0...VQQVBCCO7&th=1
But, motorcraft filters have the logo cast into the filter body, easy to identify.
I picked it up about 10:45 am. I then ran the truck hard for the last 2 hours. It appears to be running well. (I didn't go pull my trailer but will probably do that over the weekend). I checked under the hood and underneath for any leaks, etc and it looks clean.
The truck was less than quarter full so I filled up (44 gallons) and added in Hotshot's Secrets Everyday Diesel Treatment (EDT). I was previously running the Ford PM-22A but after a bunch of research have decided to switch to Hotshot's EDT. It probably makes little difference but it makes me feel better so there is that. :-)
I greatly appreciate everyone's support and advice during this ordeal. Hopefully, this is all behind me and I can drive my truck another couple of years. When it comes time to trade, I am not sure what I will do. I have a strong aversion to purchasing another Ford Diesel if it has the CP4. FORD CORPORATE - ARE YOU HEARING ME? (probably not but again saying it makes me feel better)
Thanks again fellers - this forum has been an invaluable resource to me for many years and I greatly appreciate it.
Happy Friday!
I've never worried about cleaning additives, and have only had to use an anti-gel additive one time, and that was way back in my 18 wheeler days.
So, I don't know, maybe I'll do it to begin with then maybe trade out for a non-CP4 diesel pickup...
I've never worried about cleaning additives, and have only had to use an anti-gel additive one time, and that was way back in my 18 wheeler days.
So, I don't know, maybe I'll do it to begin with then maybe trade out for a non-CP4 diesel pickup...

The Ford dealer I got the free filters from yesterday, (the fleet manager), was pissed I went so long on filters, (almost 22k) acted like if I get a failure it might not be warranted. i told him, i normally dont go that long and what the manuel states, etc. I have always done 15k till now, but will probably go to 10k. He said never go by them manuel unless you want it basically break. he said all the fleet trucks or any truck that tows often gets oil and filter every 5k and fuel filters every other to help the cp4. So that is a filter change every 10k!
This dealer is one of the largest fleet service centers on the east coast. (Yes, same dealer the left the pry bar under my truck).
i changed them last night, looked inside the screen filter, no algae, dirt, water,etc. Looked just as good as the new when i tore into it.
Also, stated the diff fluid needs to be changed at 30k, being they removed the trans it was just done, but the oan drop at 30k. I was plannning on that anyways.
wonder if yours wouldn't have failed if the filters were done every 10k, especially since you are all around at random stations, not the same one.
Also,
Nobody has mentioned FASS!
It filters down to 2 microns instead of the factory 4. My Duramax (LmL), had a cp4, granted no lift pump. I had the fass titanium (around $700) as well as kept the factory filter.
What I didn't see anyone really mention is on here was air! Mainly dirty fuel and smaller filter micron.
What kills the cp4 badly is clearly dirty fuel we all know, but also air. The fass has a better lift pump then ford factory one, that removes 100% air. Which on the dmax was the main killer of the CP4.
the problem i have with S&S (or whoever makes the cat spin on filter connection under the hood for 2 micron filters), is a 2 micron filter puts more strain on the lift pump, as ford engineers didnt design or test it for 2 mircron filters, i know there are videos showing ford can run them with a factory lift pump but, over time thousands of miles it may produce more air as it could get weak, etc. In my opinion in order to go tighter tolerances you need to upgrade the lift pump to push harder to eliminate strain and air bubbles over the course of thousands of miles. I guarantee if Ford put a tighter filter on it, it would have a stronger lift pump.
I say this beucase a good fix for dirty fuel is smaller microns, but if you address one issues but not the air pocket issues you will continue with issues. so i would say 2 micron filter with a higher flow lift pump, so fass or airdog in my opinion is the only option if you don't run OEM stuff.
I personally would do option 1. I talked about 30 mins ago, if you made it this far! 10k fuel filter changes.
the post is alot longer then i thought!😁
The Ford dealer I got the free filters from yesterday, (the fleet manager), was pissed I went so long on filters, (almost 22k) acted like if I get a failure it might not be warranted. i told him, i normally dont go that long and what the manuel states, etc. I have always done 15k till now, but will probably go to 10k. He said never go by them manuel unless you want it basically break. he said all the fleet trucks or any truck that tows often gets oil and filter every 5k and fuel filters every other to help the cp4. So that is a filter change every 10k!
This dealer is one of the largest fleet service centers on the east coast. (Yes, same dealer the left the pry bar under my truck).
i changed them last night, looked inside the screen filter, no algae, dirt, water,etc. Looked just as good as the new when i tore into it.
Also, stated the diff fluid needs to be changed at 30k, being they removed the trans it was just done, but the oan drop at 30k. I was plannning on that anyways.
wonder if yours wouldn't have failed if the filters were done every 10k, especially since you are all around at random stations, not the same one.
Also,
Nobody has mentioned FASS!
It filters down to 2 microns instead of the factory 4. My Duramax (LmL), had a cp4, granted no lift pump. I had the fass titanium (around $700) as well as kept the factory filter.
What I didn't see anyone really mention is on here was air! Mainly dirty fuel and smaller filter micron.
What kills the cp4 badly is clearly dirty fuel we all know, but also air. The fass has a better lift pump then ford factory one, that removes 100% air. Which on the dmax was the main killer of the CP4.
the problem i have with S&S (or whoever makes the cat spin on filter connection under the hood for 2 micron filters), is a 2 micron filter puts more strain on the lift pump, as ford engineers didnt design or test it for 2 mircron filters, i know there are videos showing ford can run them with a factory lift pump but, over time thousands of miles it may produce more air as it could get weak, etc. In my opinion in order to go tighter tolerances you need to upgrade the lift pump to push harder to eliminate strain and air bubbles over the course of thousands of miles. I guarantee if Ford put a tighter filter on it, it would have a stronger lift pump.
I say this beucase a good fix for dirty fuel is smaller microns, but if you address one issues but not the air pocket issues you will continue with issues. so i would say 2 micron filter with a higher flow lift pump, so fass or airdog in my opinion is the only option if you don't run OEM stuff.
I personally would do option 1. I talked about 30 mins ago, if you made it this far! 10k fuel filter changes.
the post is alot longer then i thought!😁
Never been any fuel filter change showing any evidence of any trash, metal, or anything that might indicate potential failure.
Were I to start running such an extreme maintenance schedule as your fleet manager friend is suggesting, I would be doing oil changes every two weeks most of the time, and fuel filters then every 4 weeks. Just not going to happen, my operating costs would go through the roof. I'd have to get a second job locally just to support the maintenance costs to do my primary job! And, then I wouldn't have the time to do all that maintenance while trying to hold down two jobs.
Owing to the number of these trucks out there that haven't had a CP4 failure, very likely that mine may never fail again, even with sticking to the owners manual maintenance schedule.
Also, my understanding is the current dmax does not use a CP4, maybe looking into one of those soon, even though they are kind of ugly.












