Cat Fuel injection pump solenoid 320D
Product Description
The Fuel Injection Pump Solenoid for CAT 320D is a critical electrical component mounted on the fuel pump of 320D / C4.4 / C6.6 engines, used to precisely control fuel flow into the high-pressure section of the pump. Part number frequently used is 326-4700 (or 312-5620 in some variations) depending on pump model. This solenoid opens or closes based on ECU signals and regulates how much fuel the pump pressurizes. A failing solenoid can lead to issues like poor rail pressure, misfires, or failure to build injection pressure, which in turn affects performance and emissions.
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Compatible part number 326-4700 for many CAT 320D engines.
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Alternative / related solenoid: 312-5620, used in certain fuel pump assemblies for 320D / C4.4 / C6.6 engines.
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Controls fuel admission to the high-pressure pump chamber, enabling proper rail pressure for injection.
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Durable design to function reliably in high-vibration, high-heat environments.
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Replacement recommended when diagnosing low pump pressure, erratic fuel delivery, or engine stalling / failure to start.
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Because this is an electrical component, check wiring and ECU signal when diagnosing ā a bad solenoid may not always be mechanical failure.
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When to Replace:
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If you observe reduced engine performance, injection pressure codes, or engine stalling tied to the pump, test the solenoid first.
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Replace during fuel pump overhauls ā solenoids are relatively cheap compared to the cost of a pump failure.
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After replacement, ensure the fuel system is bled properly and check for consistent rail pressure.
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