What Year Did Cummins Engines Have The P-Pump?
Engines have evolved to meet changing emissions standards. One innovation from Cummins to meet those standards was the mechanical injection P-Pump.
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CP4 Pump: Which Diesel Engines Use It And Why Is It So Problematic?
If your truck is powered by an LML Duramax or 6.7L Cummins, you could replace ... the CP4 with the older CP3 pump. Instead, it has parts to reroute the fuel return lines through an additional ...