Kubota V3800 Injection Pump 1J500-50505 | Genuine Kubota Reman Supply Pump

The Kubota 1J500-50505 is a genuine Kubota remanufactured high-pressure fuel injection pump, the supply pump assembly for the Kubota V3800 common rail diesel engine. It is the current number in Kubota’s 1J500-505xx supply pump series and the factory replacement for every earlier number in that chain. The supply pump builds the rail pressure the entire common rail system depends on. When it wears out you get hard starting, low power, rail pressure fault codes, and in the worst cases metal debris that takes out the injectors and rail with it. A genuine Kubota reman pump, built on the original Denso platform, is the way to fix it once and fix it right.

Application & Fitment

Confirmed applications for the 1J500-50505 supply pump:

• Engines: Kubota V3800-CR-T, V3800-CR-TE4, and V3800-CR-TIE4 (3.8L turbocharged common rail)
• Kubota M8560 utility tractor
• Kubota SVL90-2 compact track loader

The Kubota M9960 tractor uses the same V3800-CR-TE4 engine as the M8560, and aftermarket listings also place this pump family on the M4N narrow tractor, so those machines very likely take this pump as well. Kubota has superseded this pump several times, so check the number stamped on your existing pump before ordering, or simply call us with your engine model and serial number and we will verify the exact part for your machine.

Cross-Reference Part Numbers

The 1J500-50505 replaces or cross-references the following numbers:

• Kubota 1J500-50500, 1J500-50501, 1J500-50502, 1J500-50503, 1J500-50504 (earlier numbers in the supersession chain)
• Kubota reman program KEARP-1J500 (K1J500-50500 / K1J500-50501)
• Denso 294000-1720 and 294000-1721 (the OE Denso supply pump numbers for this application)

Frequently Asked Questions

Is this a new or remanufactured pump?

This is a genuine Kubota remanufactured supply pump from Kubota’s factory reman program. Reman pumps in this program are rebuilt with OEM Denso components, including a new suction control valve (SCV), and built to perform to factory spec. Reman is the standard way Kubota supplies this pump, and buying it through an authorized Kubota dealer means real warranty support, not a gray-market gamble.

How do I know the supply pump is my problem?

Typical failure symptoms on the V3800 common rail are hard starting or no start, low rail pressure fault codes, power loss under load, and engine derate. A failing pump can also shed metal into the fuel system, and if that has happened the injectors, rail, and lines need to be inspected and cleaned or replaced too, or the new pump will be contaminated on day one. We diagnose and repair common rail systems in-house every day, so if you are not sure the pump is the culprit, call us before you spend the money.

Will this pump fit my machine?

If the pump on your engine is stamped 1J500-50500 through 1J500-50505, this is the correct current replacement. Kubota advises verifying the number on the physical pump rather than relying on the machine model alone. Call us at 530-668-0818 with your engine model and serial number and we will confirm fitment before you order.

Why buy your Kubota supply pump from Valley Fuel Injection

Valley Fuel Injection & Turbo is an authorized Kubota dealer and a dedicated diesel fuel injection shop in Woodland, California, serving Northern California and Nevada since 1993. We do not just sell this pump in a box. We test, diagnose, and rebuild the very common rail systems it serves, so you get straight answers on diagnosis, fitment, and what else to replace when a pump fails.

Pricing & availability: this genuine Kubota reman supply pump is supplied to order. Call 530-668-0818 or request a quote for current pricing, availability, and lead time. Have your engine model and serial number ready so we can confirm the exact pump for your machine.