Bosch CP4 pump
Posting Guru
Joined: Aug 2007
Posts: 1,902
Likes: 26
From: BA, OK
The bypass kit does not prevent the cp4 pump from grenading it only saves the rest of the fuel system from damage when the pump grenades.
Laughing Gas
Joined: Jul 2017
Posts: 960
Likes: 4
I have used the Motorcraft pm 22a cetane booster most of the life of the truck. I buy it at the parts Dept of my Ford Dealer . Same thing with the Motorcraft DEF
and I document all these purchases.
This CP4 pump scares the crap out of me and while I love my truck, its the technical stuff like this that makes me question why I have this truck when I’m not truly hauling anything that needs a diesel. But damn, I love this truck.
and I document all these purchases.
This CP4 pump scares the crap out of me and while I love my truck, its the technical stuff like this that makes me question why I have this truck when I’m not truly hauling anything that needs a diesel. But damn, I love this truck.
New User
Joined: Aug 2019
Posts: 15
Likes: 0
I became aware of the CP4 issues before I bought my truck. I researched all I could and decide to run Opti-lube XPD from the beginning for added lubricity. So far so good. When or if my CP4 bites the bullet I'll be sure to post. Until then, I'm going to enjoy my truck and keep using Opti-lube.
New User
Joined: Jun 2019
Posts: 12
Likes: 0
Make sure your pump gets adequate lubrication. If the fuel you use is low on lube additives, like most ULSD is, then us an additive to boost the lube properties. Check the frame rail filter for sparkles (AKA aluminum shavings) If you find shavings it won't be long before the whole fuel system needs replacing.
Senior User
Joined: Aug 2018
Posts: 138
Likes: 1
I had a very similar post before purchasing my '19 6.7 .. and the overwhelming response was "not an issue anymore". no question there was a flaw in the CP4 used in multiple platforms, not unique to Ford. However the CP4.2 which was tweaked (not a full redesign) I've yet to see any serious discussion about failures. That includes other forums besides FTE. I run the same as several of you, Motorcraft cetane booster, and I'm not going to worry about this further until there's some reason to...which after a couple of years of the updated CP4 being in use, I've yet to see any indication its worth worrying about.
Posting Guru
Joined: Aug 2007
Posts: 1,902
Likes: 26
From: BA, OK
When the HPFP begins to fail it will send aluminum shavings back to the fuel tank, which the lift pump will filter out. At this point it's to late the damage has been done and a fuel contamination kit is required to repair the fuel system to the tune of just over 4k labor not included.
