Kubota 1J801-52030 is the new, genuine mechanical fuel feed pump (lift pump) for Kubota’s 03-CR series common-rail engines: the D1803-CR and V2403-CR in their E4, TE4 and TIE4 versions. It is a flange-mounted, tappet-driven pump with a hand primer built in, and it moves fuel from the tank to the high-pressure pump. Kubota lists it for the KX040-4 and U48-5 compact excavators.

A weak feed pump shows up as hard starting, loss of power under load or rail pressure faults, and on a common-rail engine it can look like a rail or injector problem. Before replacing it, check the tank pickup, the filters and the low-pressure lines for restrictions and air leaks.

Specifications

Fits / Applications

• Kubota D1803-CR-E4, D1803-CR-TE4 and D1803-CR-TIE4 engines (some builds)
• Kubota V2403-CR-E4, V2403-CR-TE4 and V2403-CR-TIE4 engines (some builds)
• Kubota KX040-4 compact excavator
• Kubota U48-5 compact excavator

Clean the mounting face and fit a new mounting seal. After installation, use the hand primer to fill and bleed the low-pressure side before cranking, then check every fitting for leaks. On a common-rail engine, change the fuel filters at the same time and cap every open line so no dirt gets in.

Part Numbers & Cross Reference

Kubota 1J801-52030

Cross-reference numbers can change with engine serial, build year and emissions tier, so treat this list as a starting point. Send us your engine serial number and we will confirm the exact match against your build before anything ships. That check is free and takes a few minutes.

Frequently Asked Questions

Will 1J801-52030 fit a D1803 or V2403 that is not common-rail?

No. Kubota uses different lift pumps, including electric ones, on D1803 and V2403 engines that are not common-rail. Check that your engine model contains CR, for example V2403-CR-TE4.

Which machines and engines does 1J801-52030 fit?

Kubota lists it for the KX040-4 and U48-5 compact excavators. It fits some builds of the D1803-CR and V2403-CR engines in E4, TE4 and TIE4 versions. Call 530-668-0818 with the engine or machine serial number and we will confirm at no charge.

Does the 1J801-52030 feed pump have a hand primer?

Yes, a hand primer is built in. After installation, use it to fill and bleed the low-pressure side before cranking, then check every fitting for leaks.

What else should I replace with the feed pump on a D1803-CR or V2403-CR?

Fit a new mounting seal. On a common-rail engine, change the fuel filters at the same time and cap every open line so no dirt gets in.

Related Parts

• Kubota V2403-CR D1803-CR Injection Pump 1J801-50500 (Genuine)
• Kubota D1803-CR & V2403-CR Common-Rail Fuel Injector | Bosch 0445110777 New (Kubota 1J801-53052)
• Kubota D1803-CR-TIE4 & V2403-CR-TIE4 Common-Rail Fuel Injector | Bosch 0445110775 New
• Kubota V2403 D1803 SCV Suction Control Valve 1J801-50540 (Genuine)

Why Buy From Valley Fuel Injection

We are an authorized Kubota dealer and a diesel fuel-injection shop in Woodland, CA, working on diesel engines since 1993. When you call, you talk to people who know Kubota engines and can help you match the part number to your engine serial or machine model before you order. See our Kubota engine sales, parts and service.