What’s failing: The CP4 pump’s roller‑tappet design struggles with low‑lubricity U.S. diesel fuel, leading to internal wear and metal debris contamination. Who’s affected: GM Duramax (2011–2016), Ford ...

It's very common knowledge that engines rely on fluids to operate. While the various oils, water, and fuels are referred to as a powerplant's "life bloods," the latter liquid—diesel, for our ...

Ram temporarily returned to the Bosch CP3 high-pressure fuel pump in 2021 after widespread failures of the CP4.2 pump in 2019–2020 Cummins-powered HD trucks. The CP4.2’s tighter tolerances and higher ...

When the fifth-generation Ram HD pickup debuted for the 2019 model year, it brought with it a raft of updates, including a revamped Cummins 6.7-liter inline-six diesel engine offering the Ram a ...