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3975375 High Pressure Injection Fuel Pump 3975375 for Cu-mmins Qsl8.9 Qsl9 Engine Parts
| MOQ: | 1 pieces |
| Price: | US $359-379 / piece |
| Payment Method: | L/C,D/A,D/P,T/T |
This diesel engine high-pressure fuel supply pump assembly (standard part code: 3975375; common OE cross-reference and interchangeable parts include 3975375PX, 3975375RX, 5256607, 0445020088, 0445020150, etc., widely compatible with 8.3L/8.9L ISC, ISL, QSL series large-displacement diesel engine platforms, commonly used in medium and heavy-duty trucks, engineering vehicles, city buses, and large generator sets). As the power core of the entire high-pressure common rail system, it is responsible for establishing and maintaining low-pressure diesel fuel at ultra-high steady-state pressure, precisely supplying it to the rail cavity and various actuators, ensuring that the fuel supply quantity and pressure perfectly match the engine's combustion requirements under different operating conditions.
The product adheres to the manufacturing process of "high-pressure steady-state output, precision-engineered wear-resistant and corrosion-resistant." The pump body is made of high-density forged alloy steel, and the internal plunger assembly and fuel metering valve are made of specially quenched alloys, combined with a low-friction surface-hardened coating, significantly enhancing its resistance to pressure, wear, and diesel fuel contamination. After installation, equipment operators and fleet maintenance personnel will experience significant performance improvements: rapid and crisp start-up, quick and stable oil pressure build-up at low idle speeds; and abundant and sustained power output under heavy loads or continuous operation of full-power generators, without idling fluctuations or high-load stalling, effectively ensuring fuel supply efficiency and high equipment uptime.
| OE No. | 3975375 |
| Type | Fuel Injector |
| Car Make | Diesel Car |
| Packing | Neutral Packing or Customize Packing |
| Warranty | 1 Year |
| MOQ | 1PC |
Problems Solved: Addresses common issues such as accumulated tolerances exceeding standards in parts, high-pressure oil seal leakage, and slow oil pressure build-up caused by third-party OEM distribution, while also reducing procurement costs associated with multi-level distribution.
Value Brought: Leveraging a self-operated standardized production base for precise control, eliminating intermediate markups, and ensuring highly consistent pressure and flow parameters for each high-pressure pump, this reduces maintenance budgets while providing robust and reliable power support for equipment operation.
Problems Solved: Addresses the issue of pressure relief, jamming, and response delays that can occur with low-end heavy-duty oil pumps under complex operating conditions, leading to reduced engine power or frequent downtime.
Value Brought: Each high-pressure pump undergoes fully automated digital testing before leaving the factory, meticulously calibrating pressure stability and sealing response under simulated high-temperature and ultra-high-pressure conditions, ensuring immediate usability upon installation and significantly saving time and costs associated with equipment disassembly, assembly, and debugging.
Problems Solved: Addresses the costly delays and lost workdays caused by fuel pump failures affecting high-frequency productivity tools such as commercial freight and engineering power generation equipment.
Value Brought: The warehousing center maintains ample stock of best-selling specifications year-round, enabling rapid response after order confirmation and packing and dispatch within 24-48 hours, significantly shortening the logistics and delivery cycle. This helps fleets and project owners quickly restore equipment availability and effectively avoids downtime losses.
Problems Solved: Addresses early wear, scoring, and pressure loss issues in internal plunger components caused by differences in diesel fuel impurities and lubrication levels across different regions.
Value Brought: The core plunger components undergo special alloy hardening treatment and are combined with a low-friction surface layer, significantly improving wear resistance and corrosion resistance. This maintains high-pressure, stable fuel supply even in harsh environments, reducing additional expenses from frequent disassembly and repairs.
| Parameter Name | Parameter Value |
|---|---|
| Product Name | Heavy-Duty Diesel Engine High-Pressure Common Rail Fuel Pump Assembly |
| Standard OE Part Number | 3975375 |
| Interchangeable Part Number | 3975375PX / 3975375RX / 5256607 / 0445020088 / 0445020150 |
| Applicable Engine Platform | ISC / ISL / QSL Series 8.3L / 8.9L Diesel Engines |
| Fuel Supply System | Electronic High-Pressure Common Rail System |
| Pump Body Material | High-strength, High-Density Forged Alloy Steel |
| Internal Plunger Material | Aerospace-Grade Quenched Special Alloy Steel / Ultra-Wear-Resistant Coating |
| Maximum Working Pressure | ≥ 1800 bar Steady-State Output |
| Operating Temperature Range | -40°C to +120°C |
| Internal Sealing Components | Original Equipment Manufacturer (OEM) High Temperature and High Pressure Resistant Special Fluororubber (FKM) |
| Unit Net Weight | Approx. 11.8 kg / unit |
| Factory Testing Standards | 100% Automated Bench Test Under Full Operating Conditions for Pressure and Sealing |
Long-Distance Heavy-Duty Transportation and Highway Tractor-Trailer Operations: Heavy-duty trucks and logistics tractors often operate at full load during inter-provincial trunk line transportation, placing extremely high demands on the continuous fuel supply capacity of the high-pressure oil pump. When truck drivers notice insufficient acceleration or insufficient oil pressure causing engine power reduction during uphill driving, the maintenance team promptly replaces this high-pressure oil pump. After replacement, the oil pressure builds up quickly and stably, providing ample and smooth acceleration under heavy loads, ensuring timely and efficient long-distance transportation.
Large-Scale Engineering Generator Sets and Continuous Power Supply Scenarios in the Field: Generator sets and engineering transport vehicles operate continuously and at full load in field mining areas or construction sites. When equipment exhibits abnormalities such as start-up delays or severe fluctuations in speed and oil pressure under increased load, on-site technicians promptly replace the high-pressure oil pump. A stable fuel pressure supply ensures the engine maintains a constant speed during full-power operation, guaranteeing continuous and stable power output for engineering and operations.
A: Each high-pressure oil pump undergoes full-condition pressure and flow calibration before leaving the factory. Provided the fuel lines are clean, a professional technician can install it directly using the standard connector torque.
A: We have our own production base and large warehouse, and we maintain a large inventory of this model. Standard orders can be shipped within 24-48 hours, and large-volume orders can be arranged for rapid factory production.
A: All oil pumps are assembled in a Class 100 cleanroom and undergo 100% high-temperature, ultra-high-pressure dynamic bench testing. Strict monitoring of build-up pressure, oil return volume, and sealing performance ensures stable performance after installation.
A: We offer a 12-month warranty for this product. During the warranty period, in the event of performance failure due to non-human factors, we will provide rapid replacement or after-sales technical support to protect your rights as a user.
