DCR vs CP3 Conversion CP4 failure fixes
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Laughing Gas
Joined: Mar 2016
Posts: 1,086
Likes: 466
From: Tennessee
DCR vs CP3 Conversion CP4 failure fixes
Some interesting thoughts:
As far as reliability I don't think their is much difference between the DCR and CP3, they are both very reliable pumps.
One very interesting advantage to the CP3 conversion is widespread availability and relieved torque on the pressed on Crankshaft gear due to the removal of a gear driven pump. Lastly since the CP3 is belt driven no need to time the pump as the CP3 has 3 pistons creating a more constant supply of fuel. Another advantage, should the pump fail replacing the CP3 pump is as easy as changing out an alternator vs the DCR which requires removal of the intakes, piping and vacuum pump which is about an 8hr job.
Just my thoughts and by the way I have a DCR installed
As far as reliability I don't think their is much difference between the DCR and CP3, they are both very reliable pumps.
One very interesting advantage to the CP3 conversion is widespread availability and relieved torque on the pressed on Crankshaft gear due to the removal of a gear driven pump. Lastly since the CP3 is belt driven no need to time the pump as the CP3 has 3 pistons creating a more constant supply of fuel. Another advantage, should the pump fail replacing the CP3 pump is as easy as changing out an alternator vs the DCR which requires removal of the intakes, piping and vacuum pump which is about an 8hr job.
Just my thoughts and by the way I have a DCR installed
Cross-Country
Joined: Nov 2010
Posts: 61
Likes: 39
I would like to see some more information regarding the idler shaft setup that holds the vacuum pump gear. I'm sure it has bearings on it. How are they lubricated and cooled? What happens if a bearing on that thing fails? Are they readily available bearings? My truck has a DCR also and I think just doing that removes stress from the gear train. The DCR spins MUCH easier than the CP4.
I don't disagree that the belt driven CP3 will be easier to replace but in my opinion the reality is 90% of people won't be doing that job on the side of the road regardless so I don't see this point as a huge benefit at least in my opinion. Also looking around at S&S's dealer network you could probably have a pump the next day if needed.
I don't disagree that the belt driven CP3 will be easier to replace but in my opinion the reality is 90% of people won't be doing that job on the side of the road regardless so I don't see this point as a huge benefit at least in my opinion. Also looking around at S&S's dealer network you could probably have a pump the next day if needed.
Hotshot
Joined: Jul 2013
Posts: 14,305
Likes: 2,198
the cp3 is not any better than the cp4
I had the cp3 in my prior 6.4 and there was always metal dust in the fuel filter
internet threads were full of failed cp3 fuel systems
its a forgotton fuel pump for sure...meaning most have forgotton how bad it is
no dpk option for the cp3, by nature of its design, no one could build a dpk for it......and thats why I got rid of my prior truck and bought a 6.7 so I can install a dpk on it.
putting a cp3 in your 6.7 is going back wards
and if you have dual alternators...your going to have to give up one of them.
nice gimmick though....would be a better gimmick to pitch some kind of cummings fuel pump
I had the cp3 in my prior 6.4 and there was always metal dust in the fuel filter
internet threads were full of failed cp3 fuel systems
its a forgotton fuel pump for sure...meaning most have forgotton how bad it is
no dpk option for the cp3, by nature of its design, no one could build a dpk for it......and thats why I got rid of my prior truck and bought a 6.7 so I can install a dpk on it.
putting a cp3 in your 6.7 is going back wards
and if you have dual alternators...your going to have to give up one of them.
nice gimmick though....would be a better gimmick to pitch some kind of cummings fuel pump
Laughing Gas
Joined: Jan 2024
Posts: 850
Likes: 464
From: Up in Texas
the cp3 is not any better than the cp4
I had the cp3 in my prior 6.4 and there was always metal dust in the fuel filter
internet threads were full of failed cp3 fuel systems
its a forgotton fuel pump for sure...meaning most have forgotton how bad it is
no dpk option for the cp3, by nature of its design, no one could build a dpk for it......and thats why I got rid of my prior truck and bought a 6.7 so I can install a dpk on it.
putting a cp3 in your 6.7 is going back wards
and if you have dual alternators...your going to have to give up one of them.
nice gimmick though....would be a better gimmick to pitch some kind of cummings fuel pump
I had the cp3 in my prior 6.4 and there was always metal dust in the fuel filter
internet threads were full of failed cp3 fuel systems
its a forgotton fuel pump for sure...meaning most have forgotton how bad it is
no dpk option for the cp3, by nature of its design, no one could build a dpk for it......and thats why I got rid of my prior truck and bought a 6.7 so I can install a dpk on it.
putting a cp3 in your 6.7 is going back wards
and if you have dual alternators...your going to have to give up one of them.
nice gimmick though....would be a better gimmick to pitch some kind of cummings fuel pump
What kit did you use to replace the K16 with a CP3?
Cargo Master
Joined: Jul 2011
Posts: 2,679
Likes: 983
From: Walpole, MA
the cp3 is not any better than the cp4
I had the cp3 in my prior 6.4 and there was always metal dust in the fuel filter
internet threads were full of failed cp3 fuel systems
its a forgotton fuel pump for sure...meaning most have forgotton how bad it is
no dpk option for the cp3, by nature of its design, no one could build a dpk for it......and thats why I got rid of my prior truck and bought a 6.7 so I can install a dpk on it.
putting a cp3 in your 6.7 is going back wards
and if you have dual alternators...your going to have to give up one of them.
nice gimmick though....would be a better gimmick to pitch some kind of cummings fuel pump
I had the cp3 in my prior 6.4 and there was always metal dust in the fuel filter
internet threads were full of failed cp3 fuel systems
its a forgotton fuel pump for sure...meaning most have forgotton how bad it is
no dpk option for the cp3, by nature of its design, no one could build a dpk for it......and thats why I got rid of my prior truck and bought a 6.7 so I can install a dpk on it.
putting a cp3 in your 6.7 is going back wards
and if you have dual alternators...your going to have to give up one of them.
nice gimmick though....would be a better gimmick to pitch some kind of cummings fuel pump
I do have a soft spot for the CP3, it was great in my 04.5 CR cummins back in the day.
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