This is a new, genuine Kubota fuel injector, part number 1J050-53900. Kubota sells it as a nozzle holder kit (HOLDER,NOZZLE,KIT): the complete mechanical injector with its nozzle. It fits the Kubota V1505 1.5 liter four-cylinder diesel in Kubota’s 1J050 part series, the build with a diesel particulate filter (DPF) that Kubota engine dealers list under the V1505-T line. Kubota’s parts catalog lists it for the B3350 compact tractor (B3350HSD, B3350HSDC, B3350SUHSD), the F3990 front mower and ZD1511 zero-turn mowers. The engine takes four.

The V1505 has used several injectors, and this 1J050 number is its own part. It is a mechanical injector fed by an injection pump, not the electronic common-rail injector used on later V1505 machines such as the LX3310. Typical reasons to replace one are hard starting, smoke, a miss at idle or a fuel knock. A pop test for opening pressure and spray pattern tells you whether the injector is at fault, and air in the fuel or a worn injection pump can cause the same complaints.

Specifications

Fits / Applications

• Kubota V1505 four-cylinder diesel, 1.5 L, DPF-equipped builds in Kubota’s 1J050 part series (V1505-T line)
• Kubota B3350 compact tractor: B3350HSD, B3350HSDC, B3350SUHSD
• Kubota F3990 front mower
• Kubota ZD1511 zero-turn mowers: ZD1511LF, ZD1511RL, ZD1511RLF and the -3 versions of each
• Four injectors per engine

Clean the injector bore and seat, fit new sealing washers or heat seals, and tighten to the torque in the Kubota workshop manual for your engine. Bleed the fuel system, then check the injection lines and the return line for leaks after the first run.

Part Numbers & Cross Reference

Kubota 1J050-53900

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 the 1J050-53900 fit my Kubota B3350?

Yes. Kubota’s parts catalog lists it for the B3350HSD, B3350HSDC and B3350SUHSD, along with the F3990 front mower and ZD1511 zero-turn mowers. Send us your serial number if you want us to double check.

Is this the same injector as 1G677-53903 or 1G065-53902?

No. Those are Kubota injector kits for other V1505 builds. This 1J050 number is the one Kubota lists for the B3350, F3990 and ZD1511, so order by the number on your old injector or by serial number.

Will the 1J050-53900 fit an LX3310 or a ZD1611?

No. Those machines run the common-rail V1505, and Kubota lists injector kit 1J070-53074 for them. This 1J050-53900 is the mechanical injector for the B3350, F3990 and ZD1511.

Is the 1J050-53900 new or remanufactured?

New, genuine Kubota. The engine takes four, and this listing is for one injector.

Related Parts

• Kubota D1005, D1105 & V1505 Fuel Injector, Nozzle Holder Kit | Genuine Kubota 1G065-53902
• Kubota V1505 Common-Rail Fuel Injector Kit for LX3310, F3710 & ZD1611 | Genuine Kubota 1J070-53074
• Kubota D1005, D1105 & V1505 Fuel Injector for BX2680, RTV-X1100C | Genuine Kubota 1G677-53903
• Kubota V1505 Engine Stop Solenoid Assembly for B3350, F3990 & ZD1511 | Genuine Kubota 1E366-60012

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 we check the part number against your engine serial or machine model before anything ships, so the right part arrives the first time. See our Kubota engine sales, parts and service.