Exergy Performance is the gold standard for high-precision diesel fuel system components— from injector sets and CP3/CP4 pumps to cutting-edge Alpha Pumps and rail pressure control hardware. This hub is your guide to choosing the right Exergy parts for Duramax, Cummins, and Power Stroke builds.
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The Rail Pressure Relief Valve (RPRV) is a mechanical safety valve on the common-rail fuel system. Its job is to vent excess rail pressure back to return when pressure exceeds a threshold. A weak or leaky RPRV bleeds off rail pressure early, causing low power, unstable commanded vs. actual rail, surging, and hard starts.
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Exergy Alpha Pumps are engineered as a system, not just a high-flow pump. Compared to generic “race” pumps, Alpha focuses on controlled delivery, efficiency, and repeatable rail tracking across the usable RPM/load range.
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Frequently Asked Questions:
Q: What makes Exergy injectors different from other brands?
A: Exergy focuses on precision: matched sets, documented flow data, and nozzle design (SAC/VCO) that delivers clean, repeatable fueling for power with drivability.
Q: Do I need a lift pump with Exergy CP3/Alpha pumps and larger injectors?
A: Strongly recommended. A quality lift pump stabilizes supply pressure and filtration, extending pump and injector life.
Q: How do I choose injector size (Sportsman vs. 45% vs. 100%+)?
A: Match flow to your goals and turbo. Tow/stock-turbo builds typically use Sportsman/≤45%; larger turbos and race builds step up to 100%+.
Q: What does the rail pressure relief valve do?
A: It protects the system by venting excess rail pressure. Weak or leaky valves cause low rail pressure, surging, and hard starts—upgrading ensures stable commanded pressure under load.
Q: Why are Exergy Alpha Pumps superior to standard “race” pumps?
A: Alpha Pumps are engineered for controlled delivery and efficiency with calibrated output, keeping rail tracking tight for clean power and better drivability.