Kubota V2403-CR D1803-CR Injection Pump 1J801-50500 (Genuine)
Kubota Injection Pump 1J801-50500 | Genuine Supply Pump for V2403-CR and D1803-CR
The Kubota 1J801-50500 is the genuine high pressure supply pump, Kubota catalog description “PUMP,ASSY(SUPPLY)”, for Kubota’s Tier 4 common rail engine family. Built by Bosch for Kubota, it generates the rail pressure that feeds the injectors on D1803-CR and V2403-CR engines used in Kubota compact excavators, wheel loaders, tractor loader backhoes, and L, MX, and M series tractors. Kubota has superseded this number to 1J801-50501 and then 1J801-50502. All three numbers are the same interchangeable pump, and we supply the current genuine part. Valley Fuel Injection is an authorized Kubota dealer with a full common rail repair shop behind every part we sell.
Application & Fitment
This supply pump is confirmed for Kubota Tier 4 common rail engines:
- Kubota V2403-CR (Tier 4, including the V2403-CR-EF03 variant)
- Kubota D1803-CR (Tier 4)
Kubota used more than one fuel system configuration across D1803-CR and V2403-CR machines. Please verify fitment by engine serial number before ordering. Call us with your machine model and serial number and we will confirm the correct pump in the Kubota parts system before you order.
Cross-Reference Part Numbers
- Bosch 0445020200 (the Bosch service number for this common rail pump)
- Kubota supersessions: 1J801-50501, 1J801-50502 (current number, fully interchangeable)
- Kubota remanufactured exchange: KEARP-1J801
Frequently Asked Questions
Is 1J801-50500 the same pump as 1J801-50501 and 1J801-50502?
Yes. Kubota superseded 1J801-50500 to 1J801-50501 and then to 1J801-50502. The pumps are interchangeable, and ordering any number in the chain gets you the current genuine part.
Should I replace anything else when this pump fails?
Often, yes. When a high pressure pump fails it can send metal debris through the rail, lines, and injectors, and that debris will quickly damage a new pump if it is not cleaned out. Our common rail repair shop can test your injectors and tell you exactly what your engine needs, so you only fix it once.
How do I know this pump fits my machine?
The safest way is your engine serial number. The D1803-CR and V2403-CR family used more than one pump and rail configuration, so call 530-668-0818 with your machine model and engine serial number and we will verify the exact part before you buy.
Why do I see this pump cheaper online?
Short answer: it is usually not the same part, and a failed pump can damage the rest of the fuel system. Read why ↓
Search any OE number and eBay, Amazon and a dozen storefronts will show it well under dealer cost, sold by outfits with no name, no address and no phone number. We lose business to those listings every week, and we see a lot of them come back through our shop. Here is what is actually different.
- The part number proves nothing on its own. Counterfeit injectors and pumps are stamped with the same OE numbers as the real thing, in housings cast to look identical. The number in the listing title tells you what the seller claims it is, not what came off an OE line.
- “Remanufactured” is not a regulated word. A genuine reman unit is stripped to bare components, has its wear parts replaced (nozzle, plunger and barrel, solenoid, seals) and is then run on a calibration bench until it meets the original flow and response spec. A cheap one is very often cleaned, resealed, painted and shipped. Both get called remanufactured.
- No full teardown, so no idea what is worn. A proper rebuild means the unit comes apart completely and every part gets inspected and measured against spec, not just the ones that are obviously bad. Skip the teardown and you are reusing worn internals inside a freshly painted housing. It will run on the truck. It will not last.
- No factory-spec bench load testing. A unit is not finished until it has been run under load on a test bench and made its numbers across the range, not just at one easy point. That bench time is most of what you are paying for. Sellers working on price cut it first, because nobody can see it in a photo.
- The warranty has to be honored by someone. Everything we remanufacture in house carries a one-year warranty, with 30 days on electrical components. Parts we supply from other manufacturers carry the manufacturer’s own warranty. Either way you call us, a real shop in California, and we sort it out. A marketplace warranty usually means shipping the part overseas at your own cost and hoping for a reply.
- A failed pump damages the rest of the fuel system. When a high-pressure pump fails, it sends metal through the rails, the lines and every injector. That is why fuel contamination kits exist. A pump that was never tested to spec puts all of that at risk.
We are an authorized Kubota dealer and a working fuel-injection shop. We have been rebuilding and testing this hardware in Woodland since 1993, and the people who answer the phone are the people who run the benches. Not sure this is the right part for your engine? Call us with your serial number before you order and we will confirm it. And if a price somewhere else looks too good, call 530-668-0818 and we will tell you straight whether it is a deal or a problem.
Related Parts
- Kubota V2403 D1803 SCV Suction Control Valve 1J801-50540 (Genuine)
- Kubota D1803-CR & V2403-CR Common-Rail Fuel Injector | Bosch 0445110777 New (Kubota 1J801-53052)
- Same fit, other version: Kubota V2403-CR / D1803-CR Fuel Injection Pump 0445020200 (Genuine Bosch)
- Kubota V2403 D1803 Fuel Injector 1J801-53052 (Genuine)
- Kubota Common Rail Assembly 1J804-50603 for L3301 L3901 KX040-4 (Genuine)
- Kubota V2403 D1803 Fuel Injector 1J808-53052 (Genuine)
- Kubota D1803-CR & V2403-CR Mechanical Fuel Feed Pump (KX040-4, U48-5) | Genuine Kubota 1J801-52030
Why Buy From Valley Fuel Injection
We are Valley Fuel Injection & Turbo in Woodland, CA, diesel injection specialists since 1993 and an authorized Kubota dealer. We are not a box mover. We test, diagnose, and repair common rail systems every day, so when you buy genuine Kubota engine parts from us you also get straight answers on diagnosis, installation, and what else to check. If you would rather hand off the whole job, our diesel fuel injection services cover everything from injector testing to complete fuel system repairs.
Shipping
Ships by UPS to all 50 states, including Alaska and Hawaii. Your rate shows at checkout. Questions? Call 530-668-0818 or contact us online. Please have your engine model and engine serial number ready so we can confirm fitment and the current superseded part number before you order.
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