Another CP4 option from RCD
FTE Legend
Joined: Mar 2017
Posts: 31,879
Likes: 9,171
From: Western NY
"New feed port, preventing any contaminated crankcase debris from entering the plungers and barrels. (Built in disaster prevention kit)"
FTE Legend
Joined: Mar 2017
Posts: 31,879
Likes: 9,171
From: Western NY
Fuel Delivery Pressure Switch
The fuel delivery pressure switch is a normally closed switch that monitors the fuel delivery system pressure prior to the high pressure fuel injection pump. The fuel delivery pressure switch opens when the fuel system pressure reaches 17.5 kPa (2.5 psi) or above. If the fuel delivery system pressure drops below 17.5 kPa (2.5 psi) the switch closes and the PCM notifies the driver by displaying a low fuel pressure warning in the message center, and an engine derate occurs to protect the pump . in ford 6.7 . . this kind of put vacuum theory to rest as it not the 2.5 psi drop that has been killing ford pumps its water and lack of lube in the fuel . and its well documented . lack of lube that damages the roller weather its from water or lubricity or air bubbles any way you look at it its a lube issue combined with aggressive cam lobe causing a flat spot to form and in extreme case piston rotation due to metal on metal and binding and
>>>>in major cases locking pump up and taking out the engine .<<<<
you might want to acknowledge fuel issue . and is there real world durability testing for the product as this idea was done early on 6.7 pump and it did not hold up well . due to fuel leaking at where pin was machined in from internal pressures. i dont remember what company try it but it was around 2016 . i would like to see more on the mods done internal to correct the feed issue in the pump
The fuel delivery pressure switch is a normally closed switch that monitors the fuel delivery system pressure prior to the high pressure fuel injection pump. The fuel delivery pressure switch opens when the fuel system pressure reaches 17.5 kPa (2.5 psi) or above. If the fuel delivery system pressure drops below 17.5 kPa (2.5 psi) the switch closes and the PCM notifies the driver by displaying a low fuel pressure warning in the message center, and an engine derate occurs to protect the pump . in ford 6.7 . . this kind of put vacuum theory to rest as it not the 2.5 psi drop that has been killing ford pumps its water and lack of lube in the fuel . and its well documented . lack of lube that damages the roller weather its from water or lubricity or air bubbles any way you look at it its a lube issue combined with aggressive cam lobe causing a flat spot to form and in extreme case piston rotation due to metal on metal and binding and
>>>>in major cases locking pump up and taking out the engine .<<<<
you might want to acknowledge fuel issue . and is there real world durability testing for the product as this idea was done early on 6.7 pump and it did not hold up well . due to fuel leaking at where pin was machined in from internal pressures. i dont remember what company try it but it was around 2016 . i would like to see more on the mods done internal to correct the feed issue in the pump
Hotshot
Joined: Jul 2013
Posts: 14,266
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So if it has a built in DPK as the website says…then it has to be a gen1 type of DPK and not a gen2 type. Which means…it will quickly clog up and cuase the fuel to take the original serial path..if it’s modeled after gen1 type dpk’s.
Cross-Country
Joined: Nov 2010
Posts: 61
Likes: 39
What exactly are the "compression problems"? I could see the pump causing PTV interference if it brought the camshaft to a sudden halt especially since the crankshaft gear is not keyed to the crank. Any idea what RPM it was at when the pump broke?
I have seen 1 other HPFP explode like that and split the case. It was not a Bosch pump and didn't cause any other engine damage.
I have seen 1 other HPFP explode like that and split the case. It was not a Bosch pump and didn't cause any other engine damage.
FTE Legend
Joined: Mar 2017
Posts: 31,879
Likes: 9,171
From: Western NY
FTE Legend
Joined: Mar 2017
Posts: 31,879
Likes: 9,171
From: Western NY
Hotshot
Joined: Jul 2013
Posts: 14,266
Likes: 2,187
Also sounds like if you have a 2020 or later plus a DPK, you are functionally equivalent to a DCX.
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Lead Driver
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I'm interested to see how the DCR plays out as owners get more miles and years on them.
Cargo Master
Joined: Feb 2020
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I've heard negative comments from some Ford "experts" saying to stay away from the CPX. Not sure why, and I have never dug in to find out. Never had an interest in replacing a cp4 for another cp4, so haven't really looked into it.
I'm interested to see how the DCR plays out as owners get more miles and years on them.
I'm interested to see how the DCR plays out as owners get more miles and years on them.
Lead Driver
Joined: Dec 2020
Posts: 8,639
Likes: 2,433
The built in DPK of the CPX, or DPK's in general?
S&S has done a good job of proving that their DPK works. Hard to deny it after seeing their torture test.
S&S has done a good job of proving that their DPK works. Hard to deny it after seeing their torture test.
Cargo Master
Joined: Feb 2020
Posts: 2,277
Likes: 949
The DPK. I guess it would matter whether it was gen1 or gen2, but either way when I see a youtube 'mechanic' bashing it I dismiss them as a hack.
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