When the 2019 Rams were introduced in 2019, their 6.7-liter diesel engines used CP4.2 injection pumps, before reverting to the CP3, but why did they switch?
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Ram reverts to CP3 pump after CP4.2 failure issues
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 ...
Starting in 2011, Ford and General Motors began using Bosch Mobility CP4 pumps to provide high pressure fuel to their diesel engines. GM used the pump on its 6.6-liter LGH and LML Duramax diesel ...
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