4001791 Cummins fuel injectors are critical components in diesel engines, ensuring precise fuel delivery for optimal combustion. Below are their characteristics, applications, and key information:

Precision Engineering:

Designed for high-pressure fuel delivery (up to 30,000+ psi in common-rail systems).

Tight tolerances ensure accurate fuel metering and atomization.

Durability:

Made from hardened materials (e.g., stainless steel, tungsten carbide) to withstand extreme pressures and temperatures.

Compatibility:

Tailored for specific Cummins engine series (e.g., ISX, QSB, B Series, X15).

Advanced Technologies:

Electronically Controlled: Features solenoid or piezoelectric actuators for precise timing.

Common Rail or HEUI: Depending on the engine model (e.g., HPCR for newer engines).

Emission Compliance:

Optimized to meet EPA Tier 4, Euro VI, and other emission standards by reducing unburned fuel.

Application Scenarios

On-Highway Vehicles:

Heavy-duty trucks (e.g., Cummins ISX15 in Freightliners).

Buses and RVs.

Off-Highway Equipment:

Construction machinery (excavators, bulldozers).

Agricultural tractors and harvesters.

Industrial/Generator Sets:

Backup power generators (e.g., Cummins QSK60).

Marine engines.

Military/Defense:

Used in armored vehicles and military transport due to reliability.

Key Information

Common Part Numbers:

Remanufactured: 4001791 (fits various Cummins engines).

OEM Alternatives: 5288989, 4909944 (varies by engine model).

Symptoms of Failure:

Hard starts, misfires, excessive smoke (black/white), increased fuel consumption.

Maintenance Tips:

Use ultra-low-sulfur diesel (ULSD) to prevent deposits.

Replace filters regularly to avoid clogging.

.