Diesel Fuel Pump 041479901904 14799033 0414799041 Unit Pump 0986445023 for Mercedes-Benz

Product Description

This heavy-duty electronically controlled unit pump (high-pressure diesel supply pump assembly)—bearing part identification code 0414799019 (with common OE cross-references including 0414799001, 0414799002, 0414799003, 0414799005, 0414799006, 0414799009, 0986445006, 20450251, 20460158, etc.)—is precision-engineered for the D12D/D12C series 12L inline-six heavy-duty diesel engine platform. It is widely installed in equipment such as FM12 and FH12 heavy-duty tractors, trucks, and industrial diesel generator sets. Serving as the core power unit of the fuel supply system—responsible for generating extreme injection pressures and delivering precise fuel quantities—it efficiently pressurizes diesel and delivers it uniformly to the injection system based on millisecond-level pulse signals from the Electronic Control Unit (ECU), ensuring a continuous and stable fuel supply across diverse and demanding operating conditions.

The pump body is constructed from high-strength forged alloy, while the core plunger assembly and control valve spool utilize high-hardness specialty bearing steel. These components feature low-friction polishing and ultra-hard, wear-resistant coatings to effectively prevent internal wear and high-pressure leakage caused by fuel impurities. Upon installation, operators and technicians will notice immediate, tangible improvements: cold starts are crisp and rapid, and the engine idles smoothly with quiet pump operation. Under conditions such as heavy-load hill climbing, acceleration, or long-distance cruising, throttle responsiveness is significantly enhanced, and acceleration is smooth and robust; furthermore, black smoke emissions are reduced, resulting in optimized fuel efficiency and a smooth, satisfying driving experience.

Product Advantages

Standardized Smart Manufacturing and Quality Control from the Source Factory.

We effectively reduce procurement costs by eliminating intermediary layers that often lead to issues such as excessive component tolerance deviations, uneven fuel supply pressure across cylinders, and high-pressure leakage risks. Leveraging a standardized production base, we implement end-to-end quality control and remove unnecessary markups. This ensures highly consistent injection pressure and flow rates across all cylinders, providing reliable power for vehicle and equipment operations while keeping maintenance budgets under control.

Rigorous Testing on Ultra-High-Pressure Digital Dynamic Test Benches.

We address common issues found in low-quality replacements—such as response lag, pressure-relief valve sticking (causing engine misfires and vibration), and wasted labor/costs from repeated installation and adjustment. Every pump assembly undergoes automated testing before leaving the factory; flow rates and sealing integrity are precisely calibrated across various pressure ranges in environments simulating real-world high-temperature, ultra-high-pressure conditions. This ensures "ready-to-install" performance, drastically saving time and costs associated with installation and tuning.

Large-Scale Warehousing and Rapid Shipping Response.

Recognizing that daily commuter and commercial transport vehicles are high-utilization productivity tools, we aim to prevent the costly losses incurred when fuel system failures cause vehicle downtime. Our warehouse maintains ample stock year-round; orders are packed and shipped within 24–48 hours of confirmation. This significantly shortens logistics wait times, helping fleets and owners quickly get vehicles back on the road and avoid losses due to downtime.

Special Quenched Alloy Plungers with Wear-Resistant Hardened Coatings.

We tackle issues where poor diesel lubricity or sulfur impurities in certain regions cause premature wear of precision mating parts and valve spool sticking. Our core components utilize high-hardness special bearing steel and advanced anti-corrosion surface treatments. This results in superior fatigue and wear resistance, ensuring stable performance even under harsh conditions and prolonged high-load operation, thereby reducing the extra expenses associated with frequent repairs.

Specifications Table

Application Scenarios

Heavy-duty truck long-haul trunk-line logistics and inter-provincial transport: Heavy-duty tractor units frequently operate on trunk highways, facing conditions such as full-load starts, continuous hill climbing, and long-distance high-speed cruising. When drivers notice sluggish acceleration on steep inclines, a lag in fuel pressure buildup, or increased fuel consumption, maintenance personnel should promptly replace the units with a full set of high-specification high-pressure fuel supply pumps. After installation, oil pressure builds up rapidly and steadily, and acceleration under heavy loads is responsive and powerful, ensuring the timely and efficient completion of long-haul transport tasks.

Heavy-duty construction and special equipment operations: Construction dump trucks and specialized machinery operating at earthwork sites face challenges such as high dust levels and prolonged, high-load operation. When equipment experiences slow starting, severe vibration at low idle speeds, or stalling under heavy loads, maintenance teams install this electronically controlled high-pressure pump assembly. The robust high-pressure fuel supply allows the engine to instantly deliver high torque at low RPMs, smoothly handling frequent stop-start cycles and heavy-load demands to keep projects on schedule.

1. Q: Can the oil pump be installed and used immediately upon receipt? Is recalibration required?
2. A: All products undergo full-range pressure and flow testing and calibration before leaving the factory. Provided the fuel lines are clean, the unit can be put into immediate service after installation by a professional technician using standard torque specifications and proper air-purging procedures.
3. Q: What are the lead times and stock availability for bulk orders?
4. A: We operate our own manufacturing facilities and warehousing centers, maintaining substantial stock levels for this model year-round. Standard orders are packed and shipped within 24–48 hours of confirmation, and production schedules can be rapidly adjusted to accommodate large-volume orders.
5. Q: How are product quality and performance ensured before shipment?
6. A: All high-pressure oil pumps undergo assembly in a Class 100 cleanroom environment and 100% full-range bench testing. Tests cover critical metrics such as sealing integrity, pressure build-up speed, full-load flow rate, and fuel return volume; rigorous standards ensure that every unit shipped is a premium product.
7. Q: What is the warranty period, and how is after-sales support handled?
8. A: We offer a 12-month warranty. Should a performance failure occur due to non-human factors during the warranty period, we provide rapid replacement or technical support to ensure worry-free operation.