![]() ![]() Low-Pressure Circuit In order to talk about the modified injection pumps available in the aftermarket, which feature increased displacement (i.e. The fact that the CP3 came from Bosch’s heavy-duty line of injection pumps also speaks to its great reliability, as it was designed to play a vital role in million-mile engines. The CP3 injection pump’s sole job is to create and regulate high-pressure fuel (it’s not timed with the engine’s crankshaft and camshaft). Unlike previous (pre-common-rail) injection pumps, it has fewer tasks to perform. ![]() In the case of the ’01-to-’10 Duramax and ’03-to-present Cummins, the heart of the common-rail system has been the Bosch CP3. ![]() The icing on the cake is that these cleaner-burning engines make much more power than their predecessors. Use of the common-rail system has also facilitated multiple injection events (making diesels quieter). Over the last decade, it has allowed engine builders to run higher injection pressures (as much as 29,000 psi in the new LML Duramax and 6.7L Power Stroke) in order to increase efficiency, while greatly reducing emissions. High-pressure common-rail injection technology has revolutionized the diesel industry. › Bosch Cp3 Fuel Injection Pump Service Manual ▼
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