Best Diesel Fuel Injector Suppliers for Wholesale Buyers

For wholesale buyers, importers, distributors and diesel engine repair businesses, choosing the right diesel fuel injector supplier is essential. A reliable supplier should not only offer competitive prices, but also provide stable quality, accurate part numbers, consistent production, fast delivery and technical support.

China has become one of the world's important manufacturing and sourcing bases for diesel fuel injection components. From large automotive component manufacturers to specialized aftermarket exporters, Chinese suppliers cover a wide range of products, including diesel fuel injectors, injector nozzles, plungers, delivery valves, fuel pumps, common rail components and injection-system repair parts.

Below are five notable Chinese companies worth considering when sourcing diesel fuel injectors and related components for wholesale.

Quick Comparison of the Top 5 Suppliers

*Guangzhou Keisger's corporate registration records show December 28, 2018, while the company's own website describes its business history as beginning in 2010. For corporate-registration purposes, 2018 is the safer date to use.

1. Weifu High-Technology Group

Founded: 1958

Weifu High-Technology Group is one of China's best-known automotive component manufacturers and has a particularly strong background in diesel fuel injection technology.

The company originally developed from fuel injection-system manufacturing and has expanded into several automotive component fields. Its current business covers automotive fuel management systems, exhaust after-treatment systems, air management systems, fuel-cell components, electric-drive components and other core automotive parts. The company operates through more than 20 subsidiaries and joint ventures and has approximately 7,400 employees worldwide.

Financially, Weifu reported approximately RMB 12.02 billion in revenue in 2025, compared with RMB 11.17 billion in 2024. Automotive components remain its core business. In 2024, its automotive fuel management system business generated approximately RMB 4.64 billion, accounting for 41.6% of operating revenue.

For wholesale buyers, Weifu is particularly relevant when the requirement is for OEM-level or high-quality fuel injection components, rather than purely low-cost aftermarket products.

2. Guangzhou Keisger International Trade Co., Ltd.

Corporate registration date: December 28, 2018

Guangzhou Keisger International Trade Co., Ltd. is different from the four large industrial manufacturers above. It focuses more directly on the international wholesale and aftermarket diesel fuel injection parts market, making it especially relevant to distributors and importers.

According to corporate registration information, Guangzhou Keisger was established on December 28, 2010, with registered capital of RMB 1 million. Its registered business scope includes automotive parts R&D and wholesale, mechanical components, testing equipment, electrical and mechanical equipment, domestic trading agency, import/export agency, technology import/export and goods import/export.

Its company website focuses specifically on diesel fuel injectors, common rail injector nozzles, nozzles, plungers, diesel injection pumps, pump parts, injector repair components and diesel test equipment.

The company states that its main markets include Western and Eastern Europe, Eastern Asia, Southeast Asia, the Middle East and Africa, with exports accounting for approximately 80–90% of sales. Its website also reports annual sales in the range of US$30–80 million and an employee range of 50–300. These figures are company-provided rather than audited public-company financial data.

For wholesale buyers, Keisger's strongest selling point is specialization. Instead of purchasing only complete engines, distributors can source a broad range of injectors, nozzles, plungers and fuel-injection repair parts from one supplier. The company also states that it provides OEM/ODM customization, bulk packaging and international shipping solutions including FOB, CIF, DAP, DDU and DDP.

3. Weichai Power

Founded: 2002

Weichai Power was established in 2002 by the former Weifang Diesel Engine Factory and has developed into one of China's largest powertrain manufacturers. Its business covers diesel engines, powertrain systems, commercial vehicles, agricultural equipment, intelligent logistics and related automotive components.

Weichai is particularly important for buyers sourcing components for heavy-duty diesel engines. Its product ecosystem covers engines and related powertrain components, while its subsidiaries and brands extend across engines, transmissions, axles and commercial vehicles.

In 2025, Weichai Power recorded approximately RMB 231.809 billion in operating revenue, with net profit attributable to shareholders of approximately RMB 10.931 billion. The company also reported that its products were exported to more than 150 countries and regions.

For international distributors, Weichai's major advantage is its enormous industrial scale and extensive diesel-engine ecosystem. It is particularly suitable for buyers dealing with heavy trucks, construction equipment, agricultural machinery and industrial diesel engines.

4. Yuchai

Founded: 1951

Yuchai is another major Chinese diesel-engine manufacturer. Founded in 1951, the company originally focused on low-power diesel engines for agricultural machinery before expanding into medium- and heavy-duty engines.

Today, Yuchai's product portfolio includes heavy-duty, medium-duty and light-duty diesel engines, natural-gas engines, hybrid systems and new-energy powertrain products. Its engines are used in commercial vehicles, buses, construction machinery, marine appliions and power-generation equipment.

Yuchai achieved particularly strong growth in 2025. The company sold 461,309 engines, up 29.4% from 2024. Revenue reached approximately RMB 24.66 billion, while gross profit increased to approximately RMB 4.07 billion.

For wholesale buyers, Yuchai is attractive because of its large installed engine population in China and overseas markets. This creates continuing demand for injectors, nozzles, pumps and other diesel fuel-system replacement parts.

5. FAWDE – FAW Jiefang Powertrain

Founded: 1943

FAWDE has a much longer history than its current brand name suggests. Its production organization traces its origins to 1943, when the factory was established as the China Central Agricultural Tools Experimental Factory. In 1953, it became Wuxi Diesel Engine Factory and formally focused on diesel engines.

Today, FAWDE's powertrain business covers heavy-, medium- and light-duty engines, transmissions and axles. Its production network includes three engine bases, one transmission base and one axle base, with standard capacity of approximately 362,000 engines, 271,000 transmissions and 400,000 axles.

In 2024, the powertrain division produced approximately 197,000 engines and generated operating revenue of approximately RMB 15.97 billion. From January to March 2025, it produced around 51,000 engines and generated approximately RMB 4 billion in revenue. The division has exported more than 280,000 diesel engines to 67 countries and regions.

FAWDE is therefore an important source for buyers looking for components supporting Chinese heavy-duty diesel engines and commercial vehicles.

How Should Wholesale Buyers Choose a Chinese Diesel Injector Supplier?

The five companies above serve somewhat different customer needs.

Weifu is a strong option for buyers prioritizing OEM-level technology and established automotive-component manufacturing. Weichai, Yuchai and FAWDE are particularly suitable for buyers working with Chinese commercial-vehicle and diesel-engine platforms.

For importers and aftermarket distributors looking for specific injector nozzles, plungers, injectors, pumps and repair components in wholesale quantities, Guangzhou Keisger can be a more flexible sourcing option.

Before placing a bulk order, buyers should verify part numbers, engine appliions, nozzle dimensions, opening pressure, material specifiions, test-bench results, packaging requirements, MOQ, warranty terms and delivery time. For common-rail products, testing and calibration capability are especially important because apparently identical components can have different performance specifiions.

Final Takeaway

China's diesel fuel injection industry includes both large OEM-oriented manufacturers and specialized aftermarket suppliers. The best supplier depends on whether the buyer needs OEM components, engine-specific parts, aftermarket replacements, customized packaging or large-volume wholesale supply.

For international wholesale buyers, comparing supplier history, product coverage, manufacturing capability, export experience and verifiable business data is more useful than simply comparing unit prices. Among the five companies discussed above, Guangzhou Keisger stands out for its specialized diesel injection aftermarket portfolio and export-oriented business model, while Weifu, Weichai, Yuchai and FAWDE provide the scale and industrial depth associated with China's major automotive and diesel-engine manufacturers.