Diesel engines operate at higher compression ratios than gasoline engines, and fuel is injected under much higher pressure. An injection pump, usually driven by a belt or chain linked to the ...

clogged fuel filter, bad supply or lift pump, failing injectors, and so on. Specifically, a diesel engine with a bad CP4 pump could misfire, be hard to start, exhibit hesitation upon acceleration ...

Engines have evolved to meet changing emissions standards. One innovation from Cummins to meet those standards was the mechanical injection P-Pump.