CP4 Implosion!!! CRAP! CRAP! CRAP!
Mountain Pass
Joined: Jul 2018
Posts: 153
Likes: 39
Well, the thing about priming/purging the new filters is that if you don't, the truck won't start without multiple tries, which is doing the priming but not enough, then will eventually start, but will run very rough with too much air in the system. It will eventually work the air out, but it takes quite a bit and will run rough until it does.
So, doubtful anyone would change the fuel filters without doing a good prime/purge.
So, doubtful anyone would change the fuel filters without doing a good prime/purge.
I always prime the fuel system until the system stops making gurgling/bubbling noises. Last time that was about 8 or 9 cycles of the push button, each cycle lasting 20-30 seconds. It seems by 2022 takes more cycles than my 2019 did.
Lead Driver
Joined: Nov 2005
Posts: 8,482
Likes: 4,974
But if the fuel is supposed to lubricate the CP4, it could mean excessive wear on the pump due to lack of lubrication?
I always prime the fuel system until the system stops making gurgling/bubbling noises. Last time that was about 8 or 9 cycles of the push button, each cycle lasting 20-30 seconds. It seems by 2022 takes more cycles than my 2019 did.
I always prime the fuel system until the system stops making gurgling/bubbling noises. Last time that was about 8 or 9 cycles of the push button, each cycle lasting 20-30 seconds. It seems by 2022 takes more cycles than my 2019 did.
There is only so much anyone can do when changing the filters, but any small amount of air in the system, any possible slight lack of lubrication to the pump will be negligible.
Lead Driver
Joined: Jan 2002
Posts: 8,694
Likes: 4,813
From: Itinerant
I think it would be interesting to know especially of the FTE members that have had this failure if they did their own maintenance (fuel filter) or did they rely on a dealership/ shop. This wouldn't count the failures from mishaps of say putting def in the tank and running it.
I would think an owner who does their own maintenance is more conscientious of details than a shop that gets them in get them out. Or the dealership using the guy that flip burgers yesterday and now is the oil/ quick lane technician.
I would think an owner who does their own maintenance is more conscientious of details than a shop that gets them in get them out. Or the dealership using the guy that flip burgers yesterday and now is the oil/ quick lane technician.
Lead Driver
Joined: Nov 2005
Posts: 8,482
Likes: 4,974
But, no matter what, there will still be fuel inside the pump to continue lubing the cam, the fuel, does not drain out of the pump completely when the filters are changed.
So, when the fuel filters are changed and primed, there will not be an appreciable amount of air going through the pump before a full load of fuel fills it up.
I really don't think this is a cause for the pump failing.
So, when the fuel filters are changed and primed, there will not be an appreciable amount of air going through the pump before a full load of fuel fills it up.
I really don't think this is a cause for the pump failing.
Lead Driver
Joined: Dec 2020
Posts: 8,640
Likes: 2,435
Would you put a knockoff Motorcraft oil filter on your truck to save a few bucks? Looks close enough, so it must be just as good.
Cross-Country
Joined: Apr 2023
Posts: 68
Likes: 56
From: New Mexico
Ok 6.7 Powerstroke experts... I have another question for you.
I keep thinking through both of the failures of the CP4 (on my 2011 and on my 2017). Yesterday, I finally had some time to do a little research. I keep records on everything including all of my fuel stops, where I fueled up, amount of diesel I put in etc. in a spreadsheet along with all my service work. My dealership has done all of the service work at the correct intervals on both of my Super Duties. One thing I did notice in common between my 2011 and 2017 failures is that just prior to both failures, I had the fuel filters changed. [...snip...]
Multiple people and the report I quoted indicated that air in the CP4 is major issue and can cause failure. So my question is... What if my dealership technician didn't repeat the on/off ignition procedure 6 times as indicated in the manual? Could this have been the cause of the issue? I would love for those of you more knowledgeable than me to weigh in on this...!
I keep thinking through both of the failures of the CP4 (on my 2011 and on my 2017). Yesterday, I finally had some time to do a little research. I keep records on everything including all of my fuel stops, where I fueled up, amount of diesel I put in etc. in a spreadsheet along with all my service work. My dealership has done all of the service work at the correct intervals on both of my Super Duties. One thing I did notice in common between my 2011 and 2017 failures is that just prior to both failures, I had the fuel filters changed. [...snip...]
Multiple people and the report I quoted indicated that air in the CP4 is major issue and can cause failure. So my question is... What if my dealership technician didn't repeat the on/off ignition procedure 6 times as indicated in the manual? Could this have been the cause of the issue? I would love for those of you more knowledgeable than me to weigh in on this...!
Thread Starter
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Laughing Gas
Joined: Sep 2010
Posts: 904
Likes: 112
From: Austin, Texas
But, no matter what, there will still be fuel inside the pump to continue lubing the cam, the fuel, does not drain out of the pump completely when the filters are changed.
So, when the fuel filters are changed and primed, there will not be an appreciable amount of air going through the pump before a full load of fuel fills it up.
I really don't think this is a cause for the pump failing.
So, when the fuel filters are changed and primed, there will not be an appreciable amount of air going through the pump before a full load of fuel fills it up.
I really don't think this is a cause for the pump failing.
Thanks!
Lead Driver
Joined: Feb 2005
Posts: 7,983
Likes: 2,671
From: The Great State of Texas
I agree with your analogy about failures soon after a filter change. I've noticed that myself and is why I change my own filters and go above and beyond purging the air from the fuel system by cycling 12 times.
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Lead Driver
Joined: Feb 2005
Posts: 7,983
Likes: 2,671
From: The Great State of Texas
Cargo Master
Joined: Mar 2005
Posts: 2,368
Likes: 620
Would be curious how prevalent this is. Pump failure posts get my attention here. But the vast majority of trucks/fleet trucks that’s pump exploded won’t be posted here, and more than likely just chalked off as contamination. Here, we see trucks that are obviously taken care of have failures.
Mountain Pass
Joined: Mar 2023
Posts: 103
Likes: 55
Ok 6.7 Powerstroke experts... I have another question for you.
I keep thinking through both of the failures of the CP4 (on my 2011 and on my 2017). Yesterday, I finally had some time to do a little research. I keep records on everything including all of my fuel stops, where I fueled up, amount of diesel I put in etc. in a spreadsheet along with all my service work. My dealership has done all of the service work at the correct intervals on both of my Super Duties. One thing I did notice in common between my 2011 and 2017 failures is that just prior to both failures, I had the fuel filters changed. Back in June 2015 on my 2011 Super Duty, I had the fuel filters changed about 1 week before we drove from Austin, TX up to Estes Park, CO. That is about 2.5 day trip - around 1100 miles. The day after we arrived my fuel system failed. On my 2017, I had the fuel filters changed about a month before the failure (back in June) as we were getting ready for our trip to Montana. So my you can see where I am going here.... The common thread is that the fuel filters were changed and then I had a failure. I was reading in the 2017 Owners' Manual about changing the fuel filter and noticed the following sentence "Note: No special air purge is necessary after filter servicing. The fuel system purges the air in the filters." Then further down at the end of the installation instructions for the filters is bullet point number 3 "Switch the ignition on for 30 seconds and then switch the ignition off.Repeat this operation six times in a row to purge any trapped air from the fuel system."
Multiple people and the report I quoted indicated that air in the CP4 is major issue and can cause failure. So my question is... What if my dealership technician didn't repeat the on/off ignition procedure 6 times as indicated in the manual? Could this have been the cause of the issue? I would love for those of you more knowledgeable than me to weigh in on this...
Thanks!
I keep thinking through both of the failures of the CP4 (on my 2011 and on my 2017). Yesterday, I finally had some time to do a little research. I keep records on everything including all of my fuel stops, where I fueled up, amount of diesel I put in etc. in a spreadsheet along with all my service work. My dealership has done all of the service work at the correct intervals on both of my Super Duties. One thing I did notice in common between my 2011 and 2017 failures is that just prior to both failures, I had the fuel filters changed. Back in June 2015 on my 2011 Super Duty, I had the fuel filters changed about 1 week before we drove from Austin, TX up to Estes Park, CO. That is about 2.5 day trip - around 1100 miles. The day after we arrived my fuel system failed. On my 2017, I had the fuel filters changed about a month before the failure (back in June) as we were getting ready for our trip to Montana. So my you can see where I am going here.... The common thread is that the fuel filters were changed and then I had a failure. I was reading in the 2017 Owners' Manual about changing the fuel filter and noticed the following sentence "Note: No special air purge is necessary after filter servicing. The fuel system purges the air in the filters." Then further down at the end of the installation instructions for the filters is bullet point number 3 "Switch the ignition on for 30 seconds and then switch the ignition off.Repeat this operation six times in a row to purge any trapped air from the fuel system."
Multiple people and the report I quoted indicated that air in the CP4 is major issue and can cause failure. So my question is... What if my dealership technician didn't repeat the on/off ignition procedure 6 times as indicated in the manual? Could this have been the cause of the issue? I would love for those of you more knowledgeable than me to weigh in on this...
Thanks!
