I hear all this talk about the CP4 failures but how many have happened? Personally I don't think it's a thing. I buy fuel from all over the place and I try to remember to add a additive but since there isn't a place in the truck to keep it I don't remember.

 

Search this forum. HPFP failures are uncommon. Search other diesel forums. Very few posts from people who have actually had a pump failure. Before making the choice to get a diesel, I read this and other forums. I searched a lot. Spent hours going over each issue commonly associated with diesel ownership. If you critically review what is written, most of it is just pure bull poop from people who are deeply steeped in the myth and tales from days or yore. Posts are just pitching fear and trying to convince you that you must use additives of all kinds or that your truck is so fragile, it should be driven and you made a bad choice. 'Cause there be dragons out there, you know. It is constantly regurgitated and refuses to die. I don't use additives. Yes, I know, my truck will explode on the side of the road and it's my money so I can do with it whatever I want. It's quite amusing, actually. But I don't care whether someone uses additives for diesels or gassers. There has been a market for elixirs, potions, balms, spreads or whatever since cars have been on round tires. Some of it works. Most of it is just colored and scented mineral oil.

And there are only two entities who actually know how common pump failures are on Ford trucks: One is Ford, the other is Bosch. Anyone giving you the impression they have something is talkin' smack. They don't know.

 

It does happen. At what rate, we don't know because most folks are not like us forum guys and are not on forums. You have to remember, Bosch designed these HP pumps on Euro fuel which from my reading on it, has more lubricity than our US fuel.

Here's a link to Dieselsite.com and their 6.7 fuel water separator unit. There's some good info there.

https://www.dieselsite.com/dieselsit...separator.aspx

 

Well sir, I had one go out in my ‘15. BUT I think it was caused by the fact that no less than 3 lift pumps went out in the year I had the truck.
I asked WHY did the lift pumps keep going out? There hadto be some reason, but FoMoCo could not look for the reason. All they would do was to replace said lift pump, rinse, repeat The complete fuel system wasultimately replaced under warranty (fuel was clean, Ford approved with no more questions) but by that time the original dealer where I bought it owned the truck and I was driving a new ‘16 so I have no idea if the problem was ever resolved or not.

Like you, I think it may be largely overblown; and most failures are likely self induced by DEF, gasoline, bad fuel, etc. The service manager at the dealership where my ‘15 was showed me some fuel samples from trucks brought in that had CP4 problems. Most of what he showed me would not qualify for starting a bonfire.

 

Of total trucks sold between Ford and GM, the percentage is likely incredibly low and likely happened as a result of something at some point going through the pump that shouldn't ("bad fuel"). Only internal GM, Ford and Bosch have the most accurate data on cause of failure and even then, difficult to know for sure even if a repair was decided mechanical failure of the hardware vs bad fuel at one point.

At work years ago we had a company 2013 F-350 pickup model HPFP fail 10 miles after getting fuel at a truck stop, $9,000 to repair and it ran fine after that. No I wasn't there to observe the refueling, yes I know the money was spent as it was not a warranty approved repair.

The HPFP in my truck is 11 years old and running great as far as I know.

 

As far as real info goes, the only thing I do know for sure. GM quit using the CP4, and RAM/Cummins quit after using it for two years.
There must have been reasons.

 

I've replaced one pump on a customer 2011 and my 2015 had one replaced by Ford. Common? I don't know but when I ordered the pump from Ford for the '11 I had to wait a week as they were backordered. That was two-three years ago.

 

That is interesting about your 15 that at least 3 DFCM pumps went out. Was it a bad batch of pumps or did the truck have a wiring issue that caused that? From the research I've read, the thought is that DFCM is a good pump. I would have to think that the DFCM pump problems had to have contributed to the HPFP going out. But who knows?

You're correct about only the Big Three knowing what percentage of trucks had problems and it's very likely pretty low. But from what I have read, GM and Ram were covering those fuel system repairs where Ford seems to be more less likely to cover them ( when moisture was in the Fuel). So maybe because GM and Ram were covering them, they did not want to keep losing money so decided to get away from the CP4.2. Again, who knows for sure?

Like I stated above, Don...

That is interesting for sure.

My feeling on this is that while I believe the percentage is low, it can and does happen, but not just from human error like putting gasoline or DEF in the tank. I look at the DPK kit as the same as my truck insurance. I have it but hope to not need it. But it's there if I do. I don't drive around on pins and needles worrying about a HPFP failure but just want to take preventative measures to keep the fuel system in check as I drive my truck into the future past my warranty period. It's a personal decision each truck owner has to make and everyone thinks differently on this topic.

 

As I went around with Ford over the lift pumps. I wanted to know WHY, but they couldn’t seem to come up with an answer. That particular truck had an electronc glitch since the second day I owned the truck. The first time it went into regen I got a CEL, but nobody could actually tell me what was happening. And there were some other glitches at random times that would come up, then go away. The last time the lift pump went out, I hauled it back to where I bought it on my own dime and said we need to sit down and have a serious talk. That was when they decided the complete fuel system needed replacing under warranty. I again asked what was the root cause of all that had been going on and they could not come up with an answer. But they came up with what amounted to a buy back, prorating the 20,000+ miles I had put on it. And they took all my accessories off the ‘15 and installed on the “16 I was buying on their dime, so I drove away with a new truck with new factory warranty. I was at a point where I had absolutely no faith that the ‘15 was going to be problem free, ever. But it was their baby now. What became of it IDK and don’t care.
So my thoughts on the CP4 is that as long as everything is perfect and operating as it should it is OK, at best; but if anything goes wrong it is quite fragile. But, that is just my opinion, so take it for what it is worth.
And on that note, the pretty much tried and true CP3 in the ‘18 and earlier RAM/Cummins was a huge factor when I traded my ‘16 Ford for an ‘18 3500 RAM Laramie Longhorn. It doesn’t seem to have quite the power of the Ford; but will still break the speed limit with ease when pulling my 18000 pound 5th wheel. So far in 30000+ miles I can not complain. The seating and comfort is pretty much the same between the two, and that is a huge factor for me.

 

Fuel additive that pays for itself added to meet the minimum requirements from Bosch is cheaper than replacing the complete fuel system. Fuel additive is the WD-40 of door hinges

 

That's why I use additive.

Appreciate you posting your comments, Don. And yes, there has to be a good reason why GM and Ram dumped the CP4.2 design. The Denso HPFP I hear is stout AF. The 21 6.7 Cummins uses an upgraded CP3, which is also stout AF, from what I've read. And yes, there is a reason why the aftermarket designed DPK kits. I'll acknowledge the human errors of dumping gasoline and DEF into the tanks but folks, even ones who were careful, still had their CP4.2s taken out by moisture in fuel. That's why our trucks comes with water separators with drains and manufacturers make water separators with drains. While it's probably rare, it happened, still happens and still can happen. That's what I think.

 

Thank you guys for your informative responses .
To bad they didn't make the door pocket a little wider so we could carry a bottle of additive in the truck. Another thing make the bottle like Sta-Bill with a measure on the side.

 

An unopened bottle of additive in the cab, I'm OK with. An opened, partially used bottle, no way. Too stinky in the cab. I keep my additives in an ammo box that is strapped down in the bed. My truck is not a daily drive so that work out OK.

As I recall, the 2020+ engine uses a higher pressure amount. Maybe the other fuel pumps (CP3, Denso) can't provide that?

 

Well I have been around diesel engines for a few years. Farming/ranching, drilling oilwells, running construction equipment, driving big trucks, etc for my short life. I know the fuel has changed, but there has only been one engine I religiously used an additive with………….the one I had trouble with.
Just saying.

 

s definetly a thing

water in fuel

rust cuased by high moister in fuel

dry starts from winter gelling

etc, etc