Citroën Relay III Fuel Line Hose Tube Pipe 2.2 Diesel DW12RUD 1399134080

Citroën Relay III Fuel Line Hose Tube Pipe 2.2 Diesel DW12RUD is an original fuel system component designed for the DW12RUD diesel engine. Thanks to its factory geometry and precise fitment for this specific engine unit, it ensures stable fuel delivery and proper integration with other system components. It is a practical solution for users and workshops looking to maintain consistency with the original Citroën design.

Specifications and technical data

• SKU: 1399134080
• Mark: Citroën
• Condition: Used
• OEM Part Number: 1399134080
• Substitutable numbers: D8984, 1399134080
• Fuel type: Diesel
• Part type: Line
• Category: Hoses, Lines & Pipes

Purpose and function in the fuel system

The fuel line in the Citroën Relay III with the 2.2 Diesel DW12RUD engine is responsible for the precise delivery of diesel fuel between the fuel system components. The properly selected cross-section, length, and shape of the line allow for maintaining the correct fuel pressure and flow, which translates into smooth engine operation and proper response to load.

In diesel engines, the tightness and resistance of lines to vibrations and temperature changes are particularly important. Using a component that complies with factory design specifications reduces the risk of leaks, power loss, or starting problems, and also facilitates diagnostics in the event of other fuel system faults.

Benefits of using an original Citroën line

Using a fuel line dedicated to the Citroën Relay III with the DW12RUD engine provides a number of practical service and operational benefits:

• factory fitment for the diesel engine fuel system,
• preservation of the original routing of the line in the engine bay,
• reduction of stress and twisting thanks to proper geometry,
• easier installation compared to universal replacements,
• consistency with other fuel system components.

For workshops, this means shorter installation time and a lower risk of needing modifications, and for the user – predictable fuel system behavior and stable engine operation under typical operating conditions for a commercial vehicle.

Characteristics of the used component

The offered fuel line is a used component, which in practice means it has been removed from a vehicle and verified for its suitability for further use. This type of part is a good choice in situations where maintaining the original specification while optimizing repair costs is important. A used fuel line allows for restoring the proper operation of the fuel system without the need to resort to more expensive solutions.

In the case of fuel lines, it is essential that the component maintains its mechanical integrity and does not show damage affecting its tightness. A properly selected and functional line helps maintain the correct operating parameters of the diesel engine, including even fuel dosing and stable system pressure.

Fuel type and operating specifics in a diesel engine

The line has been designed to work with a diesel fuel system, which involves higher requirements regarding pressure resistance and connection quality. In diesel engines, even minor leaks can lead to starting problems, power loss, or the appearance of errors in the engine control unit. Using a line consistent with the design of the DW12RUD unit helps to mitigate these risks.

For commercial vehicles such as the Citroën Relay III, a properly functioning fuel system has a direct impact on fuel economy, engine refinement, and reliability in daily use. Replacing a fuel line with a factory-origin component is therefore an important step in comprehensive fuel system maintenance.

If you are planning a comprehensive repair or upgrade of the fuel system area in your Citroën and need other components from the same group, such as supply lines, return hoses, or connecting pipes, check the available parts in the Citroën lines, hoses, and pipes category.

For users interested in a broader context of diesel engine operation and the impact of fuel system components on engine performance, an article describing the refreshment of the popular V6 CDI unit may be helpful – more information can be found in the material Second life of the Mercedes OM642 engine – how injectors and a turbocharger restore the power of the 3.0 V6 CDI.