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 ...

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 ...

Texas-based law firm Hilliard Martinez Gonzalez (HMG) this week filed a class-action lawsuit against General Motors over an alleged issue with Bosch CP4 fuel pumps. The suit claims Bosch designed the ...

A lawsuit against GM has been certified as a class action for General Motors customers in seven U.S. states. The lawsuit affects customers who own Chevy Silverado and GMC Sierra pickup trucks equipped ...

The black ’15 Chevrolet Silverado 2500HD work truck we encountered at Dunks Performance in Springfield, Oregon, is the typical calling card of a successful turf business. It is used every workday to ...

If you browse forums often, chances are you've come across some heated discussions around the CP4 fuel pump. The CP4, short for "Common Rail Pump 4," is a high-pressure fuel injection pump that made ...

We may receive a commission on purchases made from links. Ford introduced the V8 6.7L Power Stroke Turbo Diesel for use in its Super Duty and commercial truck lineup in 2011. Along with Ford's ...

The black ’15 Chevrolet Silverado 2500HD work truck we encountered at Dunks Performance in Springfield, Oregon, is the typical calling card of a successful turf business. It is used every workday to ...