This is a new, genuine Kubota fuel injector, part number EG504-44020. It is the gasoline injector for the Kubota WG3800, the 3.8 liter four-cylinder spark-ignition industrial engine, and it is not a diesel injector. Kubota’s illustrated parts lists show four of them on the gasoline WG3800-G-E3 and on the gasoline/LPG dual-fuel WG3800-GL-E3. They sit in the injector flange and are fed by the delivery pipe. The EG504 prefix is Kubota’s parts series for the WG3800.

A failed gasoline injector shows up as a misfire on one cylinder, a rough idle, hard starting, a fuel smell or a rich or lean code. Check fuel pressure, the injector plug and wiring, and the coil and spark plug on that cylinder before you replace an injector. Kubota also builds the WG3800 in LPG-only and natural gas versions, and Kubota’s parts lists for those show no fuel injector.

Specifications

Fits / Applications

• Kubota WG3800-G-E3 gasoline engine, four injectors per engine
• Kubota WG3800-GL-E3 gasoline/LPG dual-fuel engine, four injectors per engine
• Not used on LPG-only (L) or natural gas (N) WG3800 versions, whose Kubota parts lists show no fuel injector
• Not the injector for the WG972, WG1605, WG1903 or WG2503, which take EG522-44020

Relieve fuel pressure and disconnect the battery before you open the fuel system. Kubota’s parts list shows each injector held by a separate stopper clip, so check the clips and replace any that are bent or loose. Make sure the plug clicks home, and check for fuel leaks with the key on before you start the engine.

Part Numbers & Cross Reference

Kubota EG504-44020

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

What engine does the Kubota EG504-44020 injector fit?

The Kubota WG3800 spark-ignition engine in its gasoline (WG3800-G) and gasoline/LPG dual-fuel (WG3800-GL) versions. Kubota’s parts lists show four per engine.

Is EG504-44020 the same as EG522-44020?

No. EG522-44020 is the injector for the WG972, WG1605, WG1903 and WG2503. EG504-44020 is the WG3800 injector, and Kubota lists them as separate parts.

Does an LPG-only or natural gas WG3800 use this injector?

No. Kubota’s parts lists for the LPG-only and natural gas WG3800 show no fuel injector. Only the gasoline and dual-fuel versions carry it. Call 530-668-0818 with the model on your engine tag if you are not sure which you have.

Is it new or remanufactured?

New, genuine Kubota.

Related Parts

• Kubota WG1605, WG2503 & WG3800 Engine Ignition Coil | Genuine Kubota EG523-67090
• Kubota WG1605, WG1903, WG2503 & WG3800 Oxygen (O2) Sensor | Genuine Kubota EG523-12240
• Kubota WG2503 Gasoline/LPG Industrial Engine Electric Fuel Pump | Genuine Kubota EG522-52020

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.