Do fuel additives really work?
FTE Legend
Joined: Mar 2017
Posts: 31,782
Likes: 9,115
From: Western NY
I know a Ford tech, works at my buddy's auto shop where I take my truck, who picked up a used F250 or 350 with a 6.7 and 285k miles with what looks like the original CP4. He checked the records and cant see any indication it was replaced... He just installed a S&S DPK and will install a DPK next year... I thought of you with that kind of mileage...
Thread Starter
|
Tuned
Joined: Aug 2024
Posts: 397
Likes: 131
That's pretty cool. I'm pretty sure the Ford engineers figured out what fuel rate/pressure to feed the CP4 to compensate for decreased ULSD lubricity here in the US. Sort of like... as long as everything is perfect (ie. good fuel, no water, etc), then there will be no issues for many miles, but if there is a tiny pebble on the track, it'll derail the train. It can only help to run an additive. The reason Ram and GM had more CP4 failures is probably because they didn't know better at that time, and then never really looked back after changing pumps.
FTE Legend
Joined: Mar 2017
Posts: 31,782
Likes: 9,115
From: Western NY
That's pretty cool. I'm pretty sure the Ford engineers figured out what fuel rate/pressure to feed the CP4 to compensate for decreased ULSD lubricity here in the US. Sort of like... as long as everything is perfect (ie. good fuel, no water, etc), then there will be no issues for many miles, but if there is a tiny pebble on the track, it'll derail the train. It can only help to run an additive. The reason Ram and GM had more CP4 failures is probably because they didn't know better at that time, and then never really looked back after changing pumps.
As to the Ford engineers compensating fuel rate/pressure for the CP4, its neither. Common rail engines need enough fuel at high pressures to produce the power they are. Bosch makes the CP4 pumps and injectors if I'm not mistaken... I'm not a full time mechanic. Just read a lot.
For the later trucks, they had a special coating i believe inside the pumps to help, longer stroke and maybe bore (?), and did pin the rollers so they couldnt rotate in the housings... IIRC...
As to additives, yes, they can't hurt...
Thread Starter
|
Tuned
Joined: Aug 2024
Posts: 397
Likes: 131
Wow, is that right? I did not know that. Pinning the roller is a huge achievement if they did that.
More Turbo
Joined: Feb 2011
Posts: 601
Likes: 311
I know a Ford tech, works at my buddy's auto shop where I take my truck, who picked up a used F250 or 350 with a 6.7 and 285k miles with what looks like the original CP4. He checked the records and cant see any indication it was replaced... He just installed a S&S DPK and will install a DPK next year... I thought of you with that kind of mileage...
Lead Driver
Joined: Jan 2002
Posts: 8,625
Likes: 4,710
From: Itinerant
This is what I'll be doing in a month or so is replacing the Turbo and while it's open upgrade the CP4 to DCR. Except my truck only has 68k miles on it.
FTE Legend
Joined: Mar 2017
Posts: 31,782
Likes: 9,115
From: Western NY
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Top 10 Ford Trucks Coming to Mecum Indy 2026
Brett Foote
5 Best / 5 Worst Ford Truck Wheels of All Time
Joe Kucinski
FTE Legend
Joined: Mar 2017
Posts: 31,782
Likes: 9,115
From: Western NY
FTE Legend
Joined: Mar 2017
Posts: 31,782
Likes: 9,115
From: Western NY
I believe the "buckets," if that's the correct term, that holds the rollers that ride on the cams, were pinned for MY2020... I'm pretty sure.
About the coating, I remember reading that somewhere... maybe started with the MY15.
Here's a good thread on Bosch CP4.2s...
https://www.powerstroke.org/threads/...grade.1396427/
More Turbo
Joined: Feb 2011
Posts: 601
Likes: 311
If you don't have one, get yourself a Top Side Creeper, makes both the turbo and DCR install much easier on your back.
FTE Legend
Joined: Mar 2017
Posts: 31,782
Likes: 9,115
From: Western NY
https://bulletproofdiesel.com/search...ct&q=tech+step
Lead Driver
Joined: Jan 2002
Posts: 8,625
Likes: 4,710
From: Itinerant
Yes the '16'. Getting close to heading south with the 5th wheel and it's only a short time before mother nature starts dropping snow on the mountain passes.
Cargo Master
Joined: Jul 2011
Posts: 2,656
Likes: 964
From: Walpole, MA
I know for a fact the earlier Duramax trucks did not have a primary pump like the Fords came with right out of the gate. Not sure on the Rams. So having your HPFP pulling from the fuel tank definitely did not help those GM trucks.
As to the Ford engineers compensating fuel rate/pressure for the CP4, its neither. Common rail engines need enough fuel at high pressures to produce the power they are. Bosch makes the CP4 pumps and injectors if I'm not mistaken... I'm not a full time mechanic. Just read a lot.
For the later trucks, they had a special coating i believe inside the pumps to help, longer stroke and maybe bore (?), and did pin the rollers so they couldnt rotate in the housings... IIRC...
As to additives, yes, they can't hurt...
As to the Ford engineers compensating fuel rate/pressure for the CP4, its neither. Common rail engines need enough fuel at high pressures to produce the power they are. Bosch makes the CP4 pumps and injectors if I'm not mistaken... I'm not a full time mechanic. Just read a lot.
For the later trucks, they had a special coating i believe inside the pumps to help, longer stroke and maybe bore (?), and did pin the rollers so they couldnt rotate in the housings... IIRC...
As to additives, yes, they can't hurt...
Lead Driver
Joined: Feb 2022
Posts: 7,955
Likes: 4,039
Crack open that pump once it is off and see how the wear is. Pretty sure we are all wondering what it looks like inside.