CYEFI 0402796206 / 3094348 High-Pressure Diesel Fuel Injection Pump (Plunger Pump)

Engineered as a direct OEM-grade replacement for demanding high-horsepower applications, the CYEFI 0402796206 (interchangeable with 3094348) is a high-pressure diesel fuel injection pump purpose-built for the Cummins QST30 industrial V12 platform. This plunger-style pump serves as the hydraulic core of the common rail fuel system, tasked with generating the extreme injection pressures necessary for complete atomization in large-bore diesel engines. Designed to withstand sustained heavy loads, the CYEFI pump delivers the precise fuel volume and timing required for optimal combustion efficiency, making it a critical service component for workshops overhauling mining haul trucks, stationary generator sets, and heavy construction equipment.

The CYEFI 0402796206 is manufactured to Bosch's original equipment specifications, ensuring a true "drop-in" fit without modification. This fuel injection pump features a rugged inline plunger design optimized for the V12 configuration, delivering a consistent fuel supply to both cylinder banks. It is crucial to note the comprehensive interchange data: this unit directly replaces part numbers 3094348, 3094347, and 2881833, with the Bosch core number 0 402 796 206 serving as the industry reference . The CYEFI unit uses specialized mounting hardware, including M10 x 1.50 cap screws of varying lengths (60mm to 120mm) and specific banjo connector screws, which are typically included in a comprehensive replacement kit . For service bay efficiency, confirmation of the pump's coupling style is recommended, as proper torque transmission requires correct alignment with the drive gear, ensuring the high-pressure seal integrity is maintained from the first start-up.

This injection pump assembly is predominantly specified for the Cummins QST30 engine, a 30-liter V12 powerhouse found in off-highway machinery and marine auxiliary applications . Beyond the core QST30 platform (including CM850, CM552, and CM2350 variants), the CYEFI 3094348 is cross-compatible with specific Komatsu equipment utilizing the SAA12V140E-2 power unit . For the diesel parts distributor, this broadens the unit's utility across the Komatsu product line of large excavators and bulldozers. Workshops should verify the Engine Serial Number (ESN) to ensure compatibility, though the 3094348 variant is widely accepted as a standard heavy-duty replacement for constant-speed and variable-speed applications, making it a versatile stock item for any service center specializing in industrial diesel engine maintenance.

Installing the CYEFI high-pressure pump requires strict adherence to diesel fuel system cleanliness standards. Given the pump's role in pressurizing fuel to extreme thresholds, even microscopic contamination can cause catastrophic failure of the common rail injectors downstream. The installation process demands precise torque application; securing the fuel injection pump requires using a star pattern for the M10 flange head cap screws to ensure even clamping pressure against the gear housing . Furthermore, replacement of all sealing washers (M14) and O-rings upon installation is non-negotiable to prevent high-pressure fuel leaks . Timing the CYEFI pump to the engine is critical; the plunger pump must be synchronized with the engine's top dead center (TDC) to ensure injection timing aligns with the ECU's mapping. 

Specification Category	Detail / Requirement
Interchange Part Numbers	0402796206, 3094348, 3094347, 2881833
Industry Reference Number	Bosch 0 402 796 206
Core Engine Application	Cummins QST30 (V12), Komatsu SAA12V140E-2
ECM/Control Platforms	QST30 CM2350 T101, CM552, CM850
Critical Mounting Hardware	M10 x 1.5 Cap Screws (Lengths: 55, 60, 65, 80, 95, 100, 120mm)
Associated Sealing Components	M14 Sealing Washers, O-Rings (3678912, 4068689)
Ancillary Service Parts	Pressure Regulator Valve, Fuel Pump Kit
Expected Service Life	~8,000 - 12,000 hours (dependent on fuel quality & maintenance)
Common Failure Mode	Plunger wear leading to low rail pressure; Actuator degradation

Q1: Is the CYEFI 0402796206 a genuine OEM part or an aftermarket equivalent?
A: The CYEFI unit is manufactured to strict OEM-grade standards, functioning as a direct replacement for the Bosch 0402796206 and Cummins 3094348. It provides the reliability of a new component while often proving more cost-effective for heavy-duty rebuilds.

Q2: We have a QST30 with an older part number 3094347. Is this CYEFI 3094348 compatible?
A: Yes, the CYEFI 3094348 supersedes earlier variants and is backward compatible with applications that originally used the 3094347. Verify your kit includes the updated sealing washers .

Q3: Does the CYEFI pump assembly include the necessary drive gear or mounting hardware?
A: Typically, this fuel injection pump is sold as the primary unit only. You will need to transfer the drive gear and utilize new M10 mounting bolts to ensure proper retention .

Q4: What are the primary wear indicators that necessitate replacing this CYEFI pump?
A: Key indicators include a significant drop in rail pressure during load, increased return fuel flow, and metallic debris in the fuel filter-often resulting from cavitation damage to the plunger .

Q5: Is special equipment required to calibrate this pump after installation?
A: While the mechanical timing is set via the engine gears, final calibration and adaptation values for the common rail system must be reset using diagnostic software to match the new pump's flow characteristics to the ECU.

Q6: How does the CYEFI pump compare to salvaged or rebuilt units in terms of longevity?
A: A new CYEFI high-pressure pump eliminates the uncertainty of unknown wear history. Fresh plunger and barrel assemblies ensure consistent rail pressure from the first start, significantly outperforming used or poorly rebuilt alternatives .

 

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