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 ...
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