Is a DPK worth it ?
Lead Driver
Joined: Sep 2006
Posts: 5,665
Likes: 164
From: Cartersville, Ga
I remember reading a number the last couple years that stated 7-8% failure rate in the first 100k miles. That didn’t state if it was contamination from DEF/water/gas or just physical failure or both.
Cargo Master
Joined: Apr 2021
Posts: 2,581
Likes: 1,661
From: NW Wyoming USA
https://www.ford-trucks.com/forums/f.../poll4566.html
Lead Driver
Joined: May 2021
Posts: 5,848
Likes: 3,473
From: Uh oh, CA
Out of the 117 people that voted in this poll, 10.71% either had or knew someone that had a CP4 failure.
https://www.ford-trucks.com/forums/f.../poll4566.html
https://www.ford-trucks.com/forums/f.../poll4566.html
Tuned
Joined: Oct 2016
Posts: 303
Likes: 35
Over 60 million
If you factor in all applications and variants there are millions of CP4's out there, some more successful (6.7 PSD, believe it or not) to less successful (2019-2020 6.7 asymmetrical Cummins pump, VW diesels). There is no guarantee a cp4 will fail however when they do fail they fail big. a DPK is a smart hedge and the DCR looks like a great solution. So far preliminary results are promising and I hope that trend continues.
and, for any of you non-diesel fuel injection technicians out there - Stanadyne has produced some real turds in the past. Time will tell how whether or no the DCR will be one or not (assuming Stanadyne comes out of bankruptcy OK).
Edit: Stanadyne has come out of Bankruptcy, with the help of PE money.
Cargo Master
Joined: Jul 2011
Posts: 2,670
Likes: 974
From: Walpole, MA
have been produced by Bosch, and that was a couple of years ago.
and, for any of you non-diesel fuel injection technicians out there - Stanadyne has produced some real turds in the past. Time will tell how whether or no the DCR will be one or not (assuming Stanadyne comes out of bankruptcy OK).
and, for any of you non-diesel fuel injection technicians out there - Stanadyne has produced some real turds in the past. Time will tell how whether or no the DCR will be one or not (assuming Stanadyne comes out of bankruptcy OK).
I thought stanadyne got out of chapter 11 in September of 2023 but I could be mistaken. My biggest concern would be PE vultures in ownership squeeze the nickles out of operations.
Tuned
Joined: Oct 2016
Posts: 303
Likes: 35
Very few DB2 OEM pumps lasted more than 100K before needing work. Later ones were better. But IMO, their critical design flaw of using a steel Advance piston in an aluminum housing is an extremely poor design. Even after they chrome plated the piston, the housing bore still wears out. Compare this to the Bosch VE of the same era that uses a Teflon coated aluminum piston…there is no comparison. I’ve rebuilt hundreds of each. Every time you tear down a DB2 the advance piston bore will be worn beyond specs and I am yet to see a Bosch pump with any measureable wear in that area (even after half a million miles).
More Turbo
Joined: Jan 2016
Posts: 574
Likes: 39
Question for someone who knows the system inside and out. What pressurizes the fuel system? Could it be possible the CP4 pump doesn't get fuel for a bit resulting in failure when the fuel system is not pressurized. For example, I will hit the ignition switch without starting until I get settled. This might take about 30 sec or so, then I start it. Could it be there are folks who just jump in and start it right away resulting in the system not fully pressurized, leading the CP4 pump to run dry for a split second?
Don't be too hard on me if this question is ridiculous or doesn't make sense. 😁
Don't be too hard on me if this question is ridiculous or doesn't make sense. 😁
Lead Driver
Joined: Sep 2006
Posts: 5,665
Likes: 164
From: Cartersville, Ga
Question for someone who knows the system inside and out. What pressurizes the fuel system? Could it be possible the CP4 pump doesn't get fuel for a bit resulting in failure when the fuel system is not pressurized. For example, I will hit the ignition switch without starting until I get settled. This might take about 30 sec or so, then I start it. Could it be there are folks who just jump in and start it right away resulting in CP4 damage?
Don't be too hard on me if this question is ridiculous. 😁
Don't be too hard on me if this question is ridiculous. 😁
If you want to puke, go listen to them start a new 6.7 PSD when it rolls off the end of the assembly line. Cringe worthy how long it takes for her to turn over on average.
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More Turbo
Joined: Jan 2016
Posts: 574
Likes: 39
The low pressure fuel pump pressurizes the system. If the system is primed, there is no issue cranking normally. You shouldn’t have to prime the system like you are stating.
If you want to puke, go listen to them start a new 6.7 PSD when it rolls off the end of the assembly line. Cringe worthy how long it takes for her to turn over on average.
If you want to puke, go listen to them start a new 6.7 PSD when it rolls off the end of the assembly line. Cringe worthy how long it takes for her to turn over on average.
Lead Driver
Joined: May 2021
Posts: 5,848
Likes: 3,473
From: Uh oh, CA
I agree, throw a DPK on and enjoy it. There is no vehicle on the market that there isn't some kind of "design flaw" and even if there was, there are always lemons.
Lead Driver
Joined: Sep 2006
Posts: 5,665
Likes: 164
From: Cartersville, Ga
It shouldn’t be. I maintain a fleet of 6.7s for my brother, have personally had 3 total over the last 10 years and have countless friends and coworkers that own them. We also have a ton of them at work. It doesn’t even pop up on my radar of things to worry about with a 6.7 honestly. Not saying the CP4 isn’t picky about its operating parameters, but it also isn’t the “boogeyman” around the street corner that’s gonna beat you up and rob you either that’s it made out to be online.
Nothing wrong with due diligence if it makes you sleep better at night. Go buy a DPK and eliminate 1 of 2 physical pump failures from taking out the entire system. Or go buy a CPX or DCR. There are good options for guys and gals that worry about it. My take is that quality fuel, the correct filters, the proper system priming methods and not running the tank down to very low DTE numbers will go a LONG way. I’ve seen it first hand. Millions of miles between 100s of trucks I’ve been around personally to come to that conclusion.
Nothing wrong with due diligence if it makes you sleep better at night. Go buy a DPK and eliminate 1 of 2 physical pump failures from taking out the entire system. Or go buy a CPX or DCR. There are good options for guys and gals that worry about it. My take is that quality fuel, the correct filters, the proper system priming methods and not running the tank down to very low DTE numbers will go a LONG way. I’ve seen it first hand. Millions of miles between 100s of trucks I’ve been around personally to come to that conclusion.
More Turbo
Joined: Jan 2016
Posts: 574
Likes: 39
It shouldn’t be. I maintain a fleet of 6.7s for my brother, have personally had 3 total over the last 10 years and have countless friends and coworkers that own them. We also have a ton of them at work. It doesn’t even pop up on my radar of things to worry about with a 6.7 honestly. Not saying the CP4 isn’t picky about its operating parameters, but it also isn’t the “boogeyman” around the street corner that’s gonna beat you up and rob you either that’s it made out to be online.
Nothing wrong with due diligence if it makes you sleep better at night. Go buy a DPK and eliminate 1 of 2 physical pump failures from taking out the entire system. Or go buy a CPX or DCR. There are good options for guys and gals that worry about it. My take is that quality fuel, the correct filters, the proper system priming methods and not running the tank down to very low DTE numbers will go a LONG way. I’ve seen it first hand. Millions of miles between 100s of trucks I’ve been around personally to come to that conclusion.
Nothing wrong with due diligence if it makes you sleep better at night. Go buy a DPK and eliminate 1 of 2 physical pump failures from taking out the entire system. Or go buy a CPX or DCR. There are good options for guys and gals that worry about it. My take is that quality fuel, the correct filters, the proper system priming methods and not running the tank down to very low DTE numbers will go a LONG way. I’ve seen it first hand. Millions of miles between 100s of trucks I’ve been around personally to come to that conclusion.
I do all the things you mentioned that will "go a LONG way". I'm one of those that if I didn't have bad luck, I wouldn't have any luck at all. 😁 When I see other Super Duty's on the road, I tell the wife, " I bet they don't even know they have a CP4 pump". I'm going to just enjoy this amazing truck!
Thanks again for your reply.
More Turbo
Joined: Jan 2016
Posts: 574
Likes: 39
It shouldn’t be. I maintain a fleet of 6.7s for my brother, have personally had 3 total over the last 10 years and have countless friends and coworkers that own them. We also have a ton of them at work. It doesn’t even pop up on my radar of things to worry about with a 6.7 honestly. Not saying the CP4 isn’t picky about its operating parameters, but it also isn’t the “boogeyman” around the street corner that’s gonna beat you up and rob you either that’s it made out to be online.
Nothing wrong with due diligence if it makes you sleep better at night. Go buy a DPK and eliminate 1 of 2 physical pump failures from taking out the entire system. Or go buy a CPX or DCR. There are good options for guys and gals that worry about it. My take is that quality fuel, the correct filters, the proper system priming methods and not running the tank down to very low DTE numbers will go a LONG way. I’ve seen it first hand. Millions of miles between 100s of trucks I’ve been around personally to come to that conclusion.
Nothing wrong with due diligence if it makes you sleep better at night. Go buy a DPK and eliminate 1 of 2 physical pump failures from taking out the entire system. Or go buy a CPX or DCR. There are good options for guys and gals that worry about it. My take is that quality fuel, the correct filters, the proper system priming methods and not running the tank down to very low DTE numbers will go a LONG way. I’ve seen it first hand. Millions of miles between 100s of trucks I’ve been around personally to come to that conclusion.