Description

The Cummins Injector 3909476 (9 mm) is a precision-engineered diesel fuel injector designed to deliver accurate fuel metering, optimal atomization, and consistent injection timing for reliable combustion in Cummins diesel engines. This injector is a direct replacement for Cummins OEM part number 3909475 , making it ideal for fuel system repairs, injector replacement, and complete engine rebuilds. Manufactured to OEM specifications , this 9 mm injector is built using high-quality materials capable of withstanding high fuel pressures, elevated combustion temperatures, and continuous heavy-duty operation . The precision-machined nozzle and internal components ensure a controlled spray pattern that improves combustion efficiency, reduces excessive smoke, and supports stable engine performance. Designed for accurate fitment and dependable fuel delivery , the Cummins 3909476 injector helps restore engine power, throttle response, and fuel efficiency. Replacing worn or malfunctioning injectors during engine overhaul or fuel system service is critical to preventing rough idle, misfires, hard starting, and premature engine wear. This injector is commonly used in Cummins diesel engine rebuild, overhaul, and fuel system service applications , including on-highway trucks, industrial engines, and heavy-duty equipment requiring reliable high-flow fuel injection.