Cummins original Common Rail Diesel Fuel Injector for Cummins QSK23 QSK45 QSK60 QSK78, Fuel Injector 4326779, Replacement for OEM 4954801, Cross Reference 4326784 4902828 original new injector

The 4326779 fuel injector assembly is a Cummins diesel injection component listed for QSK-series heavy-duty engines, with QSK23 as the primary focus of this product page. It supports fuel metering, high-pressure injection, spray atomization, combustion balance, return-fuel control and engine protection. QSK23 G-Drive engines use the Cummins HPI-PT full-authority electronic fuel system, while Cummins QSK23 construction data cites injection pressure up to 29,000 psi to support response, fuel economy and emissions performance.

Positioned as an industrial-grade component for severe-duty service, the injector features heavy-duty construction, precision fuel metering, high-pressure compatibility and fine atomization. These functions support consistent combustion when the correct part is installed. Principal cross references are 4010158, 4087892 and 4088426, with 4326779NX, 4326779PX and 4326779RX among the suffix variants. This number-based presentation helps distributors, repair shops and fleet buyers compare the removed injector and organize maintenance purchasing.

Equipment categories include large mining excavators, generator sets, oilfield power units, construction machinery, mining haulage equipment, industrial stationary engines and marine auxiliary power. Because public catalogue and marketplace application data are not fully consistent, fitment should not be confirmed by engine model alone. Before shipment, buyers should provide the engine serial number, CPL, removed injector number, ECM or fuel-system type, injector photographs and equipment model. This verification process reduces the risk of incorrect supply and supports dependable heavy-duty engine maintenance.