CYEFI 0402796212 / 3093635 High-Pressure Fuel Injection Pump

For heavy-duty mining haul trucks and stationary generator sets powered by the Cummins QST30 series, the CYEFI 0402796212 High-Pressure Fuel Pump (cross-referenced with OEM Cummins 3093635 / 2881835) delivers the precise fuel metering essential for optimal combustion within the common rail diesel system. Designed as a direct mechanical replacement for the Bosch P7100-series variant, this CYEFI unit tackles persistent power-loss and extended cranking issues directly at the fuel delivery source. Your diesel repair shop or parts inventory gains a premium-grade asset engineered specifically for the 1000–1200 horsepower class, ensuring that high-value equipment returns to service with factory-spec fueling accuracy.

This mechanically governed, inline 6-cylinder injection pump from CYEFI distinguishes itself from electronically sensitive CP3 or CP4 designs by prioritizing serviceability and ruggedness. Within the QST30's fuel architecture, its plunger-and-barrel assembly pressurizes diesel to the extreme levels required for V12 combustion. Weighing approximately 22 kg, the CYEFI construction withstands the torsional vibrations and thermal cycling characteristic of mining and marine environments. Cross-referencing the Bosch 0402796212 confirms alignment with the specific fuel mapping and flow rates engineered for the QST30's 30-liter displacement. Accurate calibration for standard power applications differentiates this CYEFI unit from its high-output counterpart (3093636), making it the correct choice for the majority of field installations.

Factory-spec compatibility for the Cummins 3093635 extends across QST30 G3, G4, and G5 variants, making this CYEFI pump indispensable for servicing Caterpillar 785C haul trucks, Komatsu 830E mining vehicles, and large excavators operating in quarrying and aggregate sites. Prime power generators and marine propulsion systems utilizing the QST30 block also depend on this exact CYEFI pump for reliable fuel delivery. When a workshop encounters an engine that derates under load or exhibits extended cranking, diagnosing the fuel system and identifying the need for this specific CYEFI replacement pump (crossover Cummins 2881835) represents the logical first step toward restoring full horsepower output.

Replacing this CYEFI high-pressure fuel pump demands rigorous adherence to common rail service hygiene. Contamination presents the greatest threat-any particulate entering the high-pressure galleries will instantly score the new plungers or damage downstream injectors. Prior to installation, the fuel filter housing and supply lines must be flushed to eliminate debris. New high-pressure fuel lines with spec-compliant crush washers should replace reusing old fittings, which frequently invite leak paths. Critical attention must be given to the system priming sequence. The QST30's architecture does not self-bleed; air evacuation from the low-pressure side proceeds using the hand primer pump until fuel flows bubble-free. For the high-pressure circuit, technicians employ a diagnostic tool to command pump fill without excessive engine cranking, protecting both the new CYEFI pump and the starter motor.

Parameter	Specification / Value
Manufacturer / Brand	CYEFI (OEM Standard) / Bosch
Bosch Number	0402796212
Cummins Number	3093635 (Crossover: 2881835)
Engine Application	Cummins QST30 (G3, G4, G5)
Power Rating	Standard Power (1000–1200 HP)
Pump Type	Inline 6-Cylinder, Mechanical Governor
Supply Pressure	1800–2200 bar (High-Pressure)
Commodity Code	8413.30 (Fuel Injection Equipment)
Weight	Approx. 22 kg

Q1: How does the CYEFI 3093635 pump compare to the OEM Bosch equivalent in terms of fit and function?
A: The CYEFI unit is manufactured to OEM specifications, ensuring identical dimensional fit and hydraulic performance to the Bosch original. It offers repair facilities a high-quality alternative that maintains factory fuel pressure and delivery rates without compromising engine output.

Q2: Can the CYEFI 3093635 pump be substituted for the 3093636 high-output version?
A: Substitution is not advised without corresponding ECU recalibration. The CYEFI 3093635 is calibrated for standard power output; installing the high-output variant will induce over-fueling or insufficient rail pressure, manifesting as poor throttle response or excessive black smoke.

Q3: Which failure indicators suggest this CYEFI pump requires replacement on a QST30?
A: Worn camshaft lobes causing fuel starvation, stuck plungers from low-lubricity fuel, and internal bypass leaks that prevent the rail from reaching the 400–500 bar threshold required for injection are the primary mechanical failure modes addressed by a new  unit.

Q4: Are bench-testing procedures specific to this  pump model?
A: Yes. Delivery per cylinder must be balanced against Bosch data sheets, and the governor cut-off speed requires precise adjustment to prevent engine overspeed conditions during field operation.  units are tested to match these factory parameters.

Q5: What operational lifespan can mining fleets expect from this  pump?
A: With 10-micron filtration maintained and water contamination controlled, these pumps routinely exceed 10,000 hours before major overhaul. Fuel quality remains the decisive factor determining service intervals.

Q6: Why should a parts distributor prioritize stocking the CYEFI variant over other aftermarket options?
A: Offering a  pump provides a cost-effective, reliable alternative to the OEM Bosch unit while maintaining full interchangeability. This enables repair facilities to deliver rapid turnaround for high-value engine overhauls, directly reducing downtime costs for mining and construction operators.

 

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