​​​​​​​Premium Single Fuel Injector for Cummins 4BT 3.9L
This listing is for one (1) individual Fuel Injector compatible with the rugged 3.9L 4-Cylinder Cummins 4BT Diesel engine. If you are experiencing engine troubles like smoking, poor performance, or a rough idle, this single replacement unit is an economical way to target a failed injector without buying a complete set.
New Diesel Fuel Injectors – Cummins 4BT 5.9L 12V engines Gen 1 
Direct Replacement Fit – designed to replace the original injectors used in Dodge diesel trucks (model years 1988–1990)
Replaces OEM Part Numbers – 0432193874, 0432193877, 3919347, R4720540 (match your old part number before ordering)
Reliable Spray Pattern – each injector individually leak-tested for proper atomization and consistent fuel delivery
Helps Restore Power & Performance – fresh injectors can improve starting, throttle response, and overall engine efficiency
Application – Cummins 4BT 5.9L 12V diesel engines used in Dodge pickup / truck applications 1988–1990
What’s Included – brand-new diesel fuel injector, ready for installation (no core charge)​​​​​​​