Beginning in 2011, Ford and General Motors started utilizing Bosch Mobility CP4 pumps to supply high pressure fuel to their diesel motor. GM utilized the pump on its 6.6-liter LGH and LML Duramax diesel motor through 2016, deciding to utilize the Denso HP4 pump on the L5P Duramax, among the very best Duramax engine variations, beginning in 2017. Ram and Jeep utilized the CP4 pump on cars geared up with the 3.0-liter Cummins diesel from 2014 to 2023 with Ram likewise utilizing it on the 6.7-liter Cummins in its pickup from 2019 to 2020. Nissan participated the enjoyable, utilizing the oft-maligned CP4 pump from 2016 through 2019 on 5.0-liter V8 Cummins diesel-equipped Titan XD pickups. Ford is the just significant car manufacturer to continue utilizing the CP4 injection pump given that very first installing them on its 6.7-liter Power Stroke diesel motor.
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There are technically 2 variations of the CP4 pump, CP4.1 and CP4.2; nevertheless, they’re usually described jointly as CP4. The distinction being the CP4.1 pumps consist of a single pumping component compared to the dual-element CP4.2 pumps. As a whole, CP4 pumps are vulnerable to suffer devastating failure triggering comprehensive damage to the fuel system at or near the 100,000-mile mark.
What are the issues surrounding CP4 injection pumps?
Having actually a stopped working CP4 pump on your diesel motor would be bad enough. To start with, brand-new or remanufactured CP4 pumps can cost in between a number of hundred dollars to over $1,000, depending upon the particular automobile and the provider. The issues do not end there.
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As the CP4 pump stops working, it can launch small metal shavings into the fuel system. The metal pieces can penetrate the high-pressure fuel lines that feed the fuel rails, infecting the fuel rails themselves, the injectors, overflow valve, and fuel return lines. What’s even worse, is that the metal pieces can’t be gotten rid of by merely changing the pump and eliminating the system elements considering that even one missed out on particle might begin the cycle over once again.
Taking your truck to a trusted car service center to completely remedy the issue might set you back almost $10K unless it’s covered under service warranty (expect indication you’re being overcharged). This leads lots of truck owners to question if they’re up to the job of dealing with the job in DIY style.
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Is a CP4 injection pump replacement DIY friendly?
While DIY replacement of the CP4 injection pump and associated fuel system elements is possible, I would not precisely call it friendly. The most tough part of dealing with vehicles I’ve experienced over 40-plus years is repairing an issue with several possible sources. The bright side is that you do not always require a vehicle lift, as the bulk of the work happens under the hood.
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Stopping working CP4 injection pumps frequently present comparable signs such as polluted fuel, blocked fuel filter, bad supply or lift pump, stopping working injectors, and so on.
