Ram and Jeep used the CP4 pump on vehicles equipped with the 3.0-liter Cummins diesel from 2014 to 2023 with Ram also using it on the 6.7-liter ... Is A CP4 Injection Pump Replacement DIY ...

The CP4 fuel pump can be problematic in the long term which is why you'll want to know if your vehicle has one. Here's how to know if you have one.

One way to help take the load off a 6.6L Duramax LML engine’s high-pressure fuel pump—be it the stock CP4.2 or a CP3—is to install an aftermarket lift pump sourced from companies such as AirDog.

Fast Facts. Year/Make/Model: 1991.5 Dodge Ram 2500 W250. Owner: Matt Youdbulis. Hometown: Plymouth, Indiana. Odometer: 163,000 miles. Engine: 5.9L Cummins I-6 ...

While DIY replacement of the CP4 injection pump and associated fuel system components is possible, I wouldn't exactly call it friendly. The most challenging part of working on automobiles I've ...