294000-0490 294000-0491 Diesel Injection Pump for Isuzu N Series 4jj1 Diesel Engine Common Rail Pump 1K0a 13 800

This high-pressure diesel common-rail fuel pump assembly (Part ID: 294000-0490 / 2940000490; common OE cross-references include 22100-E0010, 22100-E0011, 22100-E0012, 22100-E0013, 22730-1040, etc.) is precision-engineered. Designed for J05E/J08E/J05C/J08C series 5.1L and 7.7L diesel engines, it is widely used in 500-series heavy-duty trucks, large buses, and various medium-to-heavy construction equipment. As the core component responsible for generating extreme rail pressure and ensuring stable fuel delivery, it efficiently pressurizes low-pressure diesel and delivers it evenly to the high-pressure fuel rail, guaranteeing a continuous and steady fuel supply across all engine speeds and operating conditions.

The pump body is constructed from high-strength forged alloy. Key components—such as the plunger and regulating valve core—undergo precision hardening and are treated with ultra-hard, wear-resistant coatings to effectively resist erosion from impurities and prevent internal pressure loss. Upon installation, users will notice a significant improvement in power delivery: cold starts are quick and smooth, idle operation is stable, and pump noise is reduced. Throttle responsiveness is markedly enhanced during heavy-load hill climbs or high-speed acceleration, restoring factory-standard driving dynamics and excellent fuel efficiency.

Manufactured directly at the source with optimized cost management across the entire process. We provide a one-stop, high-standard parts supply solution, eliminating the hassles of complex procurement, excessive intermediary markups, and inconsistent quality tolerances. Precision manufacturing on standardized assembly lines ensures highly consistent fuel pressure and flow rates across all cylinders, delivering reliable, robust power output while keeping maintenance budgets under control.

Dynamic pressure testing across all operating conditions and rigorous quality inspections. Designed to address issues such as fluctuating oil pressure, sluggish acceleration, and intermittent warning lights often caused by substandard components. Before leaving the factory, every high-pressure pump undergoes automated bench testing that simulates real-world high-temperature and high-pressure conditions. Precision testing of sealing integrity and fuel return rates across various pressure ranges ensures the unit is ready for immediate installation, significantly reducing the time and cost associated with assembly and adjustment.

Large-scale, consistent inventory and rapid shipping capabilities. Aimed at minimizing downtime losses and operational delays for commercial and commuter vehicles caused by fuel system failures. Our distribution centers maintain ample stock of core specifications; orders are quickly processed and shipped within 24–48 hours, effectively shortening wait times and helping fleets and vehicle owners get back on the road quickly.

High-hardness, corrosion-resistant valve components with wear-resistant coatings. Engineered to combat premature component wear and valve spool sticking caused by poor diesel lubricity or high sulfur content in certain regions. Key internal wear components are crafted from premium special-alloy bearing steel and treated with a specialized surface-hardening process. This ensures exceptional fatigue and wear resistance, maintaining stable performance under harsh conditions and prolonged continuous operation, thereby significantly extending service life.

Heavy-duty truck long-haul logistics and freight transport: Heavy-duty trucks equipped with 7.7L diesel engines operating under full load on trunk highways for extended periods. When vehicles experience power strain during high-gear hill climbs, sluggish acceleration, or abnormal fuel consumption, maintenance teams install this high-pressure fuel supply pump. Post-installation, fuel pressure builds rapidly and remains stable, providing robust and responsive acceleration under heavy loads, thereby ensuring the efficient and punctual completion of long-haul transport missions. Intercity and Commuter Bus Operations: Large passenger buses endure long-distance daily travel, demanding exceptional engine stability and consistent fuel delivery. When vehicles exhibit sluggish cold starts, noticeable low-speed vibration, or intermittent low-oil-pressure warnings, technicians can promptly install this high-specification high-pressure fuel pump to restore power output and smooth operation, ensuring a comfortable and safe journey.

Q: Can the fuel pump be installed and used immediately upon receipt? Is recalibration required?

A: Pressure and flow rate calibrations across all operating conditions are completed prior to shipment. Provided the fuel lines are clean, the unit can be put into service immediately after installation by a professional technician using standard torque specifications and proper air-purging procedures.

Q: What are the lead times and stock availability for bulk orders?

A: We operate our own production facilities and warehousing centers, maintaining a steady stock of this model year-round. Standard orders ship within 24–48 hours of confirmation, while bulk orders can be quickly scheduled for production.

Q: What quality tests does the product undergo before leaving the factory?

A: All products are assembled in a Class 100 cleanroom environment and undergo 100% dynamic bench testing at high temperatures and ultra-high pressures. We rigorously monitor pressure build-up, fuel return volume, and sealing performance to ensure the product meets quality standards for vehicle installation.

Q: What is the warranty period for the product?

A: We offer a 12-month warranty on this product. Should any malfunction occur due to non-human factors during the warranty period, we provide rapid after-sales technical support and service to protect your interests.