Description

This new replacement diesel fuel injector pump is specifically engineered for Cummins ISX engines, delivering consistent high-pressure fuel to the injectors for optimal combustion, fuel economy, and engine performance. Compatible with OEM part numbers 4089163RX, 4001685, 4088848, and 4089431 , this fuel pump is a reliable, cost-effective solution for truck owners and fleet operators looking to restore power and fuel efficiency. Perfect for heavy-duty trucks operating under severe conditions, this pump ensures accurate fuel metering, smoother engine operation, and improved throttle response. 🔧 Key Features: Engine Compatibility: Cummins ISX / ISX15 OEM Replacements: 4089163RX, 4001685, 4088848, 4089431 Application: Heavy-duty trucks, buses, industrial and commercial equipment Design: Precision-machined components with high-pressure tolerance Function: Ensures consistent fuel delivery and injection timing Condition: 100% brand new, not remanufactured 🔁 OEM Cross Reference Numbers: 4089163RX 4001685 4088848 4089431 ⚙️ Fits The Following: Cummins ISX Engines (including ISX15) Found in Freightliner, Peterbilt, Kenworth, Volvo, International, and other Class 8 trucks   ❓ Frequently Asked Questions (FAQs): Q1: Is this a genuine Cummins part? A: No, this is a high-quality aftermarket replacement manufactured to match OEM specifications. Q2: Do I need to program or calibrate this pump? A: Yes, calibration is required using Cummins diagnostic tools or by a certified technician after installation. Q3: What are signs of a failing fuel injector pump? A: Hard starting, poor fuel economy, rough idling, loss of power, and black smoke may all indicate a failing fuel injector pump. Q4: Is this a remanufactured pump? A: No, this is a brand-new unit—not remanufactured or refurbished. Q5: What vehicles does it fit? A: This pump fits Cummins ISX / ISX15 engines used in various Class 8 trucks such as Freightliner, Kenworth, Peterbilt, and more.