Has anyone here ever had a CP4 fail on their personal truck? Or have personal knowledge of someone with a failure?

I'm trying to decide whether one of the DPK's is worth installing, or just leave well enough alone.

Thank You.

 

It's important to know why the pump failed. Pump failures are not very common and are nearly always due to fuel contamination either by chance or owner error. In the nearly four years I've been on this forum, I've seen only a couple of unexplained, natural failures. These pumps are used both domestically and overseas. There are millions in service. It is very unlikely you will ever have a pump failure if you pay attention when fueling and not dump DEF in the fuel tank, immediately pull off the road if you get a water in fuel warning, change your fuel filters according to factory guidance, and if you live where it routinely gets below freezing to use an anti gel agent if your local fuel isn't treated as such. The additive guys will push all sorts of elixirs be added to the tank, but it's not necessary. If it helps you sleep at night, then by all means. After all, it's not very expensive and it won't cause any harm.

 

Thank you for the clarification. That is pretty much what my dealer told me too. He said the usual cause is DEF or water in the fuel. I love my 2016 F250, but all the talk about pump failures had me concerned since I have 110,000 miles on my truck. My truck is still totally stock, no deletes or tuners. Recently I have been towing 20,000 lbs of grain wagon and grain, but only about 10 miles per trip and at 35MPH. The wagon does have brakes!

 

The kit does NOTHING to prevent the pump from failing, it is supposed to stop shrapnel from getting to the injectors if the pump fails so they don't need to be replaced, and I have not seen any real proof that it does do that

 

The only first hand knowledge I have of pump failures were both DEF in the fuel tank. My barber had done that twice. I think he is a slow learner. Gets distracted when he stops for fuel and puts the wrong nozzle in the fuel tank

 

I have a DPK installed in my 6.7

on a previous truck I found metal particles in the fuel filter on one occasion and gel on another.

recent cases of gas being pumped thru the deisel dispenser at service stations has me rethinking this subject.

my current thoughts

failure due to fuel contamination will impact both the cp4 and the injectors since both need clean fuel to lube their surfaces. So a DPK on the co4 in this case won’t protectinjectors since the clean fuel condition is not met.

failure in the cases that the fuel is fine…such as the bearing cup in the cp4 rotating out of position resulting in the cp4 bearing grinding away . For this type of failure , a gen 2 DPK will protect t the injectors.

a gen 1 DPK has been forum studied and we concluded that a gen 1 DPK would provide marginal protection.

 

Damn......

 

You have to remember Forums tend to magnify a problem that is not a problem in the real world. Also, the people make these items to make money and might be on the edge of being truthful in their advertisement...

If you search this forum, you will find very few who have had CP4 issues or failures.

 

Well, sir; I had a CP4 pump failure, repaired under warranty. However, I still believe that the root cause was the fact that the DFCM / lift pump failed on that truck, I think it was 4 times in the year I owned it. FoMoCo was not able to tell me WHY the lift pumps kept going out. The truck had an electronic glitch since the second day I owned the truck. The first time it did a regen it threw all kinds of codes. Of course, after about thirty minutes the CEL went away, it re-started and I was told at the nearest dealer that nothing showed up on their computer. Then the next day, when I tried to turn on the exhaust brake, all I got was a flashing light and no e-brake. Next fuel stop I shut it down and all went away again.

After that I reached my destination in AZ and dropped ot off at a Ford dealer here and left it for two or three days, telling them I wanted to KNOW WTF was wrong. I got some lame excuse and was told all was good. Fast forward a couple months I was in the Black Hills of SD and boom……low fuel pressure….! Ford dealer there changes the DFCM / lift pump and filters. Couple months later back in AZ, same thing. I asked the dealer here the big Q……WHY is this happening. No answer. A couple months later, I was in ND with a loaded 38’ enclosed gooseneck trailer. You guessed it, same story.


I had bought this truck in Billings, Montana; which was about 350 miles from where I currently was sitting. So I called a friend that had a 26’ hydraulic tilt 14,000GVW flatbed and asked if he wanted to make a road trip. So we hauled the truck back to Billings and unloaded it in front of the shop door.
I walked in and told them that I needed to know WTF was wrong with this truck. They told me the whole fuel system needed replacing; but still could not tell me WHY this was happening. Fuel was clean and there was no evidence of contamination; so they said it was definitely a warranty claim.
But with all my rambling, I believe the cause of the failure was still some electronic glitch taking out the DFCM / lift pump, allowing the CP4 to run dry.
The rest of this story is that Billings Ford basically did a buy back on their own (Maybe Ford was involved, IDK) and I drove away with a model year newer truck with all my accessories transfered from the problem child 2015 to the new 2016.

 

My truck has 226k miles and all is stock with no fuel system failures of any type.

 

120k miles on my 2011. Motorcraft fuel filters, change at 15k miles. Quality fuel stations and PM-22-A most of the time. The only fuel system related component I've replaced was the #5 injector.

Mine may last another 11 years or it may fail the next time I drive it because I filled up in the rain yesterday after already receiving an inch 10 hours earlier.

 

My neighbor had his 2015 Duramax CP4 fail.GM covered the whole thing under warranty.

I personally am not putting any of these kits on my truck...That's just me.The pump is gonna fail if it wants to no matter what.If/when it fails I'll deal with it then,Until then,I'm gonna enjoy the miles of smiles that truck gives me.

 

From what I've seen and read, if you get a WIF light, the damage is already done. This is not from personal experience but from what I have seen online. The owner of dieselsite.com had a WIF light come on and the pump was already fried. That's why he came up the fuel filter/water separator system he sells on his website.

The reason to use a DPK kit would be to save the injectors and lines. The pump won't be saved but hopefully the kit will save the owner $$$ if or when the HPFP goes.

The additive argument is like the engine oil argument. Everyone has an opinion on it. I use K100D+. It's a multi-functional additive. I just throw it out there for FYI. I don't push it on anyone. YMMV...

 

I had the hpfp go on my '12 6.7 w/28,000 miles. Service manager showed me the contaminated fuel & said no warranty.
In hindsight, I I did have some gelling issues the winter before but never had a wif light. I used a heavy dose of 911 each time which worked like a champ! However I think I've read on here its a big no no due to maybe alcohol in it?? Not blaming it but wonder if it contributed to it.
I pretty faithfully bought my fuel from the same station in town. I suspect there was water in it.
Swore I'd never own another diesel or Ford, however as you can see from the signature below that didn't happen.
I no longer get diesel at that station & faithfully drain the primary filter regularly to inspect the fuel. I use Fords additive every fill up.
I'm seriously thinking about replacing the pump at say 75-100,000 miles just for peace of mind. Hope it makes it that far...

Keith

 

I asked my Ford parts guy why if there is a core charge, that their are no Ford Certified rebuilds? He explained that the reason Ford charges for a CP4 core, is so the bad part is turned in to be destroyed, and won't be available for quality rebuilds. They know CP4 is bad, but do not want anyone else having access to the core to undercut their price.