Product Overview

This premium remanufactured diesel fuel injector, carrying the critical OEM numbers 203-3771 and 2033771, is engineered specifically for the Caterpillar 3126B engine platform. Designed as a direct replacement for your existing Common Rail injection system, this component restores peak engine performance and fuel efficiency. Sourced from a leading manufacturing hub in Shandong, China, we supply this injector to key global markets including North America, Europe, the Middle East, and Asia-Pacific, ensuring reliable logistics to major ports and industrial centers worldwide.

Key Features & Benefits

• Precision Remanufacturing: Restored to OE specifications using high-grade stainless steel for superior corrosion resistance and long-term durability.
• Optimized Fuel Atomization: Ensures complete combustion, leading to increased horsepower, lower fuel consumption, and reduced exhaust emissions.
• Direct Fitment: A universal fit for the 3126B engine, requiring no modifications for a straightforward installation process.
• Rigorous Testing: Each injector undergoes strict flow rate and pressure testing to guarantee reliable performance under demanding operating conditions.
• Cost-Effective Solution: Get genuine performance and reliability at a fraction of the cost of a brand-new OEM unit.

Technical Specifications

OEM Cross-Reference

This injector is a direct replacement for the following original equipment manufacturer (OEM) numbers:

• 203-3771
• 2033771

Compatibility

This fuel injector is specifically designed for the following engine application:

• Engine: Caterpillar 3126B Diesel Engine

Note: The 3126B engine is commonly found in medium-duty trucks, buses, and industrial equipment. Please verify your engine’s serial number to ensure compatibility.

Global Supply & Distribution

We are a dedicated supplier of heavy-duty diesel engine parts, offering comprehensive global logistics solutions. Our supply chain is optimized to ensure fast and reliable delivery to all major international markets.

• Worldwide Shipping: We ship to over 50 countries, including the United States, Canada, Germany, the United Kingdom, Australia, the UAE, and Brazil.
• Major Ports: Efficient shipping via major hubs like Los Angeles, Rotterdam, Shanghai, Dubai, and Singapore.
• Fast Delivery: Standard lead times of 5-10 working days for in-stock items.
• Trade Compliance: We adhere to international trade regulations and provide necessary customs documentation for smooth import clearance.

Quality Assurance

Our remanufacturing process is committed to the highest standards of quality control. Each injector is disassembled, cleaned, inspected, and rebuilt with new internal components where necessary. We guarantee:

• Manufacturing Standards: All parts are produced and tested in ISO-certified facilities.
• Testing: Each unit undergoes 100% flow, pressure, and leak testing to ensure it meets or exceeds OE performance.
• Warranty: This product is backed by a standard 3-month warranty against manufacturing defects.

FAQ

Q1: Is this injector a direct replacement for my Caterpillar 3126B engine?
A: Yes, the 203-3771 injector is a universal fitment for the 3126B engine. It is designed to bolt directly into the cylinder head and connect to your existing fuel lines without any modifications. Always verify your engine’s serial number to confirm compatibility.

Q2: What is the installation procedure for a remanufactured injector?
A: Installation should be performed by a qualified diesel mechanic. Key steps include: 1) Depressurizing the fuel system. 2) Removing the old injector and cleaning the mounting bore. 3) Installing a new copper washer and O-ring (included with the injector). 4) Torquing the injector clamp to manufacturer specifications. 5) Reconnecting the fuel return line and high-pressure line.

Q3: How should I maintain my fuel injectors to ensure a long service life?
A: The most critical factor is maintaining a clean fuel supply. Always use high-quality diesel fuel and replace your fuel filters at the intervals recommended by Caterpillar. Contaminated fuel is the primary cause of injector failure. Additionally, using fuel additives to improve lubricity can help extend the life of the injector’s internal components.

Our advantages

1.An authorized wholesaler of Isuzu genuine parts, Hino genuine parts, Mitsubishi genuine parts and Mahle parts.

2. We are not only supply genuine parts, but also high quality OEM parts, which are made in China or made in Japan.

3. More than 10 years of experience in machinery parts, professional supply of diesel engine parts.

4. Fast delivery, the fastest can be shipped in one day ,more than 500,000 of different types parts in stock.

5. Scientific ERP system, easy and fast to locate the parts that customer needs.

6. Professional technician checks the parts before delivery, to make sure the parts are correct, usable and defect-free.

Exhibition

Packing&Shipping

1.  Our shipment is by air/sea/express (DHL/FEDEX/TNT/UPS/EMS).

2.  Once we get confirmation of payment, we will ship products in 2 days.

3.  Our packaging is standard export wooden box or others as your requirement.

4. We’ll check and test the products before shipping , and givethe pictures to our customers to confirm.

FAQ

Q1. What is your company major products?

A: Our main products are Liner kit, Piston, Rings, Liner, Gasket kit, Bearing, Injection pump, Nozzle, Water pump, Oil pump,Crankshaft, Turbocharger,Filter, etc.

Q2.What is the MOQ?

A: Normally we can supply any quantity if we have in stock.

Q3. What is your payment term ?

A: We accept Western Union, T/T, Paypal.

Q4. What is the packing ?

A: Carton or wooden case , If you want to put your logo on the packing , We will do it after get your authorization letter.

Q5. When can you deliver products after payment ?

A: By Express ,usually might take 3-4 days ;By Air , Usually take 7-9 days ; By Sea ,usually take 1-2 months .

Q6. What can you do to complete order perfectly ?

A: In the beginning , We will communicate with clients in details to understand what they need .

Before packing , We will check the products and send photos to clients .After confirmation ,

We will packing products well to avoid damage . Once we get tracking number ,

We will send it to customer and keep contact in with clients .