Cummins ISB 5.9 Reman Injector

• • Part Number: Cummins 3949913
  • Engine Application: ISB CM850 Series – 5.9L Common Rail Diesel Engines
  • Condition: Remanufactured fuel injector
  • Includes: New O‑rings for proper sealing
  • Core Charge: $75.00 (will be added at checkout; refundable with core return)
  • Typical Uses: Medium‑duty trucks, buses, and industrial equipment

The Reman Cummins 3949913 Fuel Injector is a, remanufactured component engineered to deliver precise fuel control and dependable performance for Cummins ISB CM850 series applications. Designed specifically for 5.9‑liter common rail diesel engines, this injector restores proper spray patterns and combustion efficiency, helping maintain horsepower, fuel economy, and reduced emissions. Built to Cummins’ strict standards and supplied with new O‑rings for a secure seal, it ensures long‑lasting reliability in demanding conditions.

Key Features & Benefits

• OEM remanufactured quality – Factory remanufactured for guaranteed performance and durability.
• Ready to install – Includes all new O‑rings, eliminating extra parts sourcing and simplifying service.
• Precise fuel delivery – Restores smooth operation, quick starts, and consistent engine power.
• Engineered for durability – Designed to handle the high pressures and temperature cycles of modern diesel operation.
• Direct replacement – Built to fit Cummins ISB CM850 5.9L engines without modification.

Compatibility & Details

The 3949913 fuel injector is intended for Cummins ISB CM850 series, 5.9‑liter Common Rail diesel engines, commonly found in medium‑duty trucks, buses, and equipment. 

Backed by Cummins engineering and remanufactured to OEM standards, the 3949913 injector provides the ideal balance of performance, value, and reliability to keep your diesel engine running at its best for the long haul.