Injection Pump Replacement
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Cross-Country
Joined: May 2011
Posts: 53
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Injection Pump Replacement
I'm looking for opinions on which injection pump to go with: CPX or DCR? What you got and have you had any problems? My 2015 has low miles but, now that I'm retired, we're gonna put some miles on it towing the RV out west. I worry about the CP4 grenading and leaving me on the side of the road, even though many have good luck with em. I'm leaning CPX but I hear good things about the DCR.
I appreciate any real-world info.
TIA
Rick
I appreciate any real-world info.
TIA
Rick
Fleet Mechanic
Joined: Oct 2022
Posts: 1,823
Likes: 898
From: Dallas Metroplex
From what I've gathered, the CPX is just a CP4 with a built-in disaster prevention kit (DPK). So, you're still getting a CP4 (same issues with potential fuel contamination and mechanical maladies).
The DCR, on the other hand, has no need for a DPK. Plus, is a totally different pump design (proven over time to be reliable).
Edit: Disclaimer, I have the DCR and no issues at all over the past 25K miles.
The DCR, on the other hand, has no need for a DPK. Plus, is a totally different pump design (proven over time to be reliable).
Edit: Disclaimer, I have the DCR and no issues at all over the past 25K miles.
FTE Legend
Joined: Mar 2017
Posts: 31,976
Likes: 9,200
From: Western NY
I'm looking for opinions on which injection pump to go with: CPX or DCR? What you got and have you had any problems? My 2015 has low miles but, now that I'm retired, we're gonna put some miles on it towing the RV out west. I worry about the CP4 grenading and leaving me on the side of the road, even though many have good luck with em. I'm leaning CPX but I hear good things about the DCR.
I appreciate any real-world info.
TIA
Rick
I appreciate any real-world info.
TIA
Rick
My 16 bought new now has 136k miles... installed a S&S Gen 2 DPK kit at 117k miles. But i have been using an additive that adds lubricity and controls water since about new.
If it was me, I'd go DCR because the internal mods the CPX gets while may stop metal from going into the rest of the fuel system, do not know enough about it, it will not prevent a failure if there were contaminates present in the fuel.
But the DCR will take a licking and keep ticking if it's exposed to water and I believe IF a failure were to happen, will not contaminate the rest of the fuel system.
Ive posted, as well as others, a video or it's a set of 3 maybe, where one of the test trucks running the DCR during testing, the owner with a aftermarket pump with filters, had been buying bad fuel as there was rust in the filter cans and water in the fuel. The DCR did not fail.
With a CPX, it would still fail and the truck would be undrivable...
IMO, if you're going through the process of removing the intake to get to the pump, might as well consider the more expensive but more reliable DCR.
But it's also not a bad idea to still run additive for fuel cleaning, anti-gel and other reasons as well... IMHO.
Good luck.
Cargo Master
Joined: Jul 2011
Posts: 2,677
Likes: 981
From: Walpole, MA
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