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Dongfeng Truck Spare Parts 6L Fuel Pump 4945791 for 6L Diesel Engine

The Cummins 4945791 (also marked as C4945791) Fuel Injection Pump Assembly is an original equipment (OE) mechanical high-pressure fuel pump manufactured by Dongfeng Cummins Engine Company (DCEC) for medium-to-heavy-duty diesel engines. Commonly referred to as the “big pump” or “P-type injection pump,” this unit is the heart of the engine’s fuel delivery system — responsible for precisely metering and pressurizing diesel fuel before sending it to the injectors.

Designed primarily for 300 horsepower (221 kW) applications, this robust P-series or P7100-derived mechanical injection pump delivers reliable performance under harsh operating conditions such as high altitude, extreme temperatures, and heavy load cycles. It was widely used on Euro II and Euro III emission-compliant engines, where full electronic control systems were not yet standard.
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  • 4945791

  • Dongfeng

Attribute Description
Product Name Mechanical Fuel Injection Pump / High-Pressure Diesel Pump
Pump Type In-line plunger-type (P-series design), typically single or multi-cylinder camshaft-driven
Drive Method Gear-driven from engine camshaft or timing gear train
Control System Mechanical governor with optional 24V electric shut-off solenoid
Fuel Output Pressure Up to 1,200 bar (varies by calibration and engine speed)
Primary Function Precisely meters and pressurizes diesel fuel for direct delivery to injectors
Internal Components Hardened alloy steel plungers and barrels (plunger-piston pair) with micron-level clearance
Lubrication Source Pressurized engine oil supplied via external oil line (not self-lubricated)
Durability Designed for rugged use; suitable for poor-quality fuels (within limits)
燃油泵 -4


燃油泵 -3


Parameter Specification
Part Number (OEM) 4945791, C4945791
Alternative Part No. 4930968, 3282610
Bosch Equivalent 0402736922, 0402736927
Engine Power Match Calibrated for ~300 PS (221 kW) output
Applicable Engine Types

- Cummins 6CT / 6CT8.3 (8.3L)

- Cummins 6L / L8.9 (8.9L)
Injection System Type Mechanical (P-type inline pump)
Governor Type Mechanical centrifugal governor with throttle linkage
Shut-Off Mechanism 24V electric stop-solenoid (for remote engine shutdown)
Fuel Compatibility Ultra-Low Sulfur Diesel (ULSD), CN GB/T 19147 compliant
Operating Temperature Range -30°C to +110°C ambient
Production Standard ISO 9001 certified; often co-developed with Bosch technology


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