
Kubota V2403 High Pressure Fuel Rail 2014-2021: OEM 1J801-50603
KUBOTA V2403 HIGH PRESSURE FUEL RAIL 2014-2021: OEM 1J801-50603

ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY

WARRANTY
1M MILES OR 1 YEAR
PRODUCT DESCRIPTION
This is a New, Bosch High Pressure Fuel Rail, Bosch part number 1J801-50603 ( OEM Part Number 1J801-50603 ).This part is primarily made for a Kubota V2403, production years 2014-2021, and comes with a One Million Miles or One Year Warranty. For additional warranty info Click Here
OEM NUMBERS
| Primary OEM | 1J801-50603 |
| Additional OEM | 1J801-50600, 1J801-50602, 1J801-50603 |
ADDITIONAL DETAILS
| CONDITION | New |
| UPC / Barcode | 00840490542402 |
| WEIGHT | 5.00 LBS |
SHIPPING OPTIONS
Ship Weight : 5.00 LBS
UPS Ground, 2nd Day Air, Next Day Air
SHIPPING POLICY
Tamerx Diesel Products ships via UPS Ground. Next day air shipping can be arranged for a reasonable price of anywhere from $50.00 - $100.00 depending on the weight of the product and your location. We will do everything we can to make sure that you get the service you need. We understand how important it is to receive your order as quickly as possible.
In most cases Tamerx Diesel Products only needs one address, as long as your product is shipping to the same location as your billing information. In order to eliminate credit card fraud, your billing information must match the credit card you provide.
The terms, conditions, and details of our warranty vary from product to product. Specific warranty details can be found below.
Tamerx Diesel Products provides a replacement warranty on all of our parts. The duration and mileage limitations of the warranty vary by product and are specified on the product's detail page/item listing.
Please note that the warranty covers replacement of the part and the cost of shipping the replacement part to you only. It does not cover any shop, labor, towing, or any similar or related costs. This is not a "money back guarantee".
If you experience a problem with your part or it is not functioning properly, the correct warranty procedure is to call us at (510) 257-1777 (8:00 AM - 5:00 PM ET Monday through Friday). Be sure to have your order number and/or other relevant order information ready so we can easily locate your order and resolve your issue as quickly as possible. From that point, we will review with you any troubleshooting steps that may need to be taken and other areas or systems that can be checked to rule out external problems contributing to your part's issue. If a replacement is determined to be necessary, we will then arrange for your replacement part to ship out ASAP and issue any necessary return shipping labels and/or documents.
As is the case for the majority of the diesel products sold on Tamerx Diesel Products, your part's warranty is active as soon as you install it. In some other cases, warranty activation is contingent upon you sending us your core (i.e., your old part). Tamerx Diesel Products will provide you a return shipping label for parts that have a warranty with a core return condition. When we have received your core return, the part's warranty coverage begins. We reserve the right to void the product warranty if your core is not received within the allotted time, or if it isn't received at all. If the warranty for the diesel part you are purchasing has a core return requirement, it will be clearly noted on the product detail page/item listing.
What is a Core Charge?
A core charge (also called "core deposit") is similar to the deposit you might pay for a can or bottle of soda and is a standard requirement in the auto parts industry. For example, in many states, to promote recycling, you pay a deposit when you purchase a can of soda and receive your deposit back when you return the empty can. Many automotive parts have a core charge, or core price, that works in essentially the same way as a soda can deposit.
30 Day Core Charge Hold
You authorize Tamerx Diesel Products, to hold your credit card for the specified core charge amount and that you agree to return your core with 30 days of receiving the purchased part. When we have received your core return, the hold is released and the core charge payment is canceled.
The customer, or parts buyer, is responsible for any shipping costs associated with core returns unless otherwise specified in the product listing/detail page. Tamerx Diesel Products offers prepaid UPS shipping labels (SKU numbers UPS-CR1 and UPS-CR2) for use in returning your core that are available for purchase on our website during your shopping/order process.
The shipping label you will need to use for the core return is dependent upon what part you are purchasing. UPS-CR1 is good for cores weighing up to 20 pounds. UPS-CR2 is appropriate for shipping cores weighing 21 pounds or more. You must include enough information with the core return that clearly identifies it as a.) a Core Return, and b.) contains enough information we can use to clearly associate the core return with your order. Including a copy of the invoice or packing slip that came with the original shipment, clearly marked "Core Return", is ideal. Alternately, you can include a note marked as "Core Return" that includes your order number, full name and address, and phone number or other contact information. Failure to include this information with your returned core will most likely delay any due core credit being issued and/or delay any applicable warranty activation. Core returns need to be for the exact part purchased and cannot be damaged. Substituting another part in place of the part you have purchased is not acceptable.
All fluids must be drained.
If you have purchased a set or a parts package, you will need to return cores for all components of the set. For example, if you have purchaed a high pressure oil pump with an IPR valve, you will need to return both HPOP and IPR valve cores to receive proper credit. If you have purchased an EGR cooler/EGR valve package, your core return must consist of an EGR cooler core and an EGR valve core, or core credit will not be given.
Core Charges are often mandated by state legislature, and, as such, the actual core charge and taxes on the charge may vary depending on the state in which you buy your part. The Tamerx Diesel Products core charge presented to you online today with your item is representative of the most common core charge.
Engineered for precision and reliability, the Kubota V2403 High Pressure Fuel Rail OEM 1J801-50603 ensures consistent fuel delivery and pressure control in V2403 engines manufactured between 2014 and 2021. This genuine OEM component is built to exact Kubota specifications, providing accurate fitment, efficient fuel distribution, and dependable performance in agricultural, construction, and industrial equipment. By maintaining proper fuel pressure, it supports smooth combustion, optimized power output, and improved fuel efficiency. Its durable, high-strength construction is designed to handle demanding operating conditions and long service intervals. For operators and technicians, this fuel rail offers OEM-certified quality and long-term reliability to keep Kubota engines running at peak performance.
FITMENT CHART
| YEAR | MAKE | ENGINE(S) | ||||
|---|---|---|---|---|---|---|
| 2014 | Kubota | V2403 | ||||
| 2015 | Kubota | V2403 | ||||
| 2016 | Kubota | V2403 | ||||
| 2017 | Kubota | V2403 | ||||
| 2018 | Kubota | V2403 | ||||
| 2019 | Kubota | V2403 | ||||
| 2020 | Kubota | V2403 | ||||
| 2021 | Kubota | V2403 | ||||
PEOPLE ALSO ASKS | BLOG(S)
The high pressure fuel rail in a modern common-rail diesel engine is a central component that ensures proper fuel delivery under demanding conditions. In the Kubota V2403 engine (from about 2014 to 2021), the OEM 1J801-50603 high pressure fuel rail performs several vital roles:
Key Roles & Function
- Maintaining High Fuel Pressure
- The rail holds fuel at the required high pressure level so that each injector can draw it instantly when commanded. This consistent pressure is essential for proper atomization and combustion.
- Distributing Fuel Evenly
- Acting as a manifold, the rail delivers fuel under high pressure to all injectors with minimal variation between cylinders. This helps maintain balanced operation and smooth performance.
- Damping Pressure Pulsations
- During injection events, pressure spikes and drops occur. The fuel rail’s internal volume and design help smooth out these fluctuations, preserving injection consistency.
- Supporting Rapid Injector Response
- Because fuel is already at high pressure and in close proximity, injectors can open and close quickly. This enables precise control over injection timing, multiple injection events, and efficient fuel usage.
- Providing Pressure Feedback
- The rail often integrates or interfaces with a pressure sensor or transducer. This sensor relays real-time rail pressure data to the engine control unit (ECU), allowing the system to adjust fuel pump output or injection strategies as needed.
The fuel rail OEM 1J801-50603 in the Kubota V2403 engine is the “backbone” of the fuel injection system: it sustains high fuel pressure, distributes it evenly to injectors, moderates pressure swings, and enables responsive injection control. All of these enable smoother power, efficient combustion, and reliable performance.
The high-pressure fuel rail plays a vital role in your engine’s performance. It stores and distributes fuel at extremely high pressure to the injectors for precise combustion. When it becomes faulty, many drivers wonder if it’s still safe to drive. The short answer is no — driving with a bad high-pressure fuel rail is risky and can lead to serious engine damage.
Why You Shouldn’t Drive with a Faulty Fuel Rail
A failing fuel rail affects both fuel delivery and pressure regulation, leading to poor performance and potential safety issues.
Common Risks of Driving with a Faulty Fuel Rail:
- Erratic engine performance
- Hesitation, rough idling, or misfires from inconsistent fuel delivery
- Loss of power
- The engine may struggle to accelerate or maintain speed
- Fuel leaks
- Damaged rails can leak, creating a significant fire hazard
- Check engine light
- Pressure irregularities trigger warning codes and reduced power mode
- Engine damage
- Running lean or rich for extended periods can cause injector or piston damage
What to Do Instead
- Stop driving immediately.
- Continuing to run the engine can make the issue worse.
- Check for visible leaks.
- If fuel is present around the rail, it’s unsafe to operate the vehicle.
- Schedule a diagnostic inspection.
- A technician can verify whether the rail, injectors, or pressure sensor is causing the fault.
- Replace the fuel rail if confirmed faulty.
- High-pressure components are not repairable and must be replaced with OEM-quality parts.
Driving with a faulty high-pressure fuel rail is unsafe and can cause severe engine damage or fire risk. If you notice performance issues, leaks, or warning lights, have your vehicle inspected and repaired immediately to protect your engine and ensure safe operation.
It maintains constant fuel pressure for accurate injector timing and consistent combustion.
Contaminated fuel, corrosion, or excess vibration can damage internal seals or fittings.
Yes, dirt or rust can block the rail and restrict injector flow.
Use clean diesel fuel and replace filters regularly as part of scheduled maintenance.


