Cummins original Common Rail Diesel Fuel Injector 4326779 Replacement for OEM Compatible with QSK23 QSK45 QSK60 QSK78 Engines Cross Reference Part Numbers 4088416 4088426 original new injector

Built for severe-duty operation, the 4326779 fuel injector delivers dependable diesel injection performance across the Cummins QSK23 engine family, a 23 L inline 6-cylinder platform rated at 760–950 hp / 567–708 kW for well-servicing and 531–736 kW prime / 603–816 kW standby in G-Drive configurations. Engineered for the Cummins High Pressure Injection HPI-PT full-authority electronic fuel system operating up to 29,000 psi, this injector assembly supports precision fuel metering and fine atomization under demanding load cycles.

This heavy-duty injector features robust construction, high-pressure compatibility, heat resistance, and reliable sealing to withstand mining, oilfield, and continuous generator applications. Cross-reference support covers 4010158, 4087892, 4088426, 4326779NX, 4326779PX, 4326779RX, 4928346, and 4928349, simplifying part-number verification for repair shops, distributors, and fleet maintenance teams. Remanufactured supply options, optional test support, and export packaging make it a practical choice for wholesale and stocking programs.

To maximize service life, focus on clean fuel, timely fuel filter replacement, water separator service, oil monitoring, return flow testing, and ECM diagnostics. Injector-related symptoms such as hard starting, rough idle, black or white smoke, low power, high fuel consumption, and misfire codes should be diagnosed through ECM scanning, fuel pressure testing, cylinder cut-out testing, and injector bench testing. Contact our team for fitment confirmation and volume pricing.