Kubota D1803 V2403 Fuel Injection Pump | 1J801-50501 | Bosch 0445020200 | New

Genuine Bosch high-pressure common rail fuel injection pump, part number 0445020200, in new condition for Kubota D1803, V2403 and C2.4 engines. Kubota references it as 1J801-50501. Bosch is the original equipment manufacturer for the fuel injection system on these engines, so this is the same pump the engine was built with. The pump generates the rail pressure the injectors meter fuel from.

Key Features

• Original equipment Bosch build, manufactured on Bosch tooling and processes
• New unit, not remanufactured or rebuilt
• High-pressure common rail pump — supplies the rail, distinct from the low-pressure feed pump
• Covers the D1803, V2403 and C2.4 on one part number
• Carried by Kubota under its own service number, so it cross-references at the dealer counter

Specifications

• Base part number: 0445020200 (Bosch published format: 0 445 020 200)
• Kubota OE reference: 1J801-50501
• Component type: High-pressure common rail fuel injection pump
• Condition: New
• Fuel system: High-pressure common rail (HPCR)
• Engines: Kubota D1803, V2403 and C2.4
• Sold as: each

Compatibility & Fitment

• Engines: Kubota D1803, V2403 and C2.4
• Equipment: compact tractors, skid steers, excavators, generator sets and industrial machinery powered by these engines

Fitment gate — Kubota uses several Bosch high-pressure pumps across its engine range and they are not interchangeable. Read the number off the pump you are removing and match it against 0445020200 or 1J801-50501, or provide your engine model and serial number.

Second fitment gate — this is the high-pressure common rail pump that feeds the fuel rail. It is not the low-pressure feed or transfer pump. Those are separate parts and a common misdiagnosis.

Installation note — replace the fuel filter and confirm the fuel supply is clean before starting a new pump. Contamination is the most common cause of repeat high-pressure pump failure.

Conclusion

This is the genuine Bosch high-pressure common rail pump for Kubota D1803, V2403 and C2.4 engines, replacing Kubota 1J801-50501. Installing the OE pump restores the rail pressure the engine calibration depends on. Confirm your engine model and match the number on your existing pump before ordering.