Mercedes W447 W906 Fuel Line Diesel Fuel Feed Return Pipe Hose A6510700935

Mercedes W447 W906 Diesel Fuel Return Line is an original fuel system component designed for diesel engines, specifically for Mercedes vehicles. As part of the Lines, Hoses, and Tubes group, it is responsible for the safe return of fuel from the injection rail or injectors to the tank, which is crucial for the stable operation of the engine.

Specifications and technical data

• SKU: A6510700935
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6510700935
• Substitutable numbers: A6510700935, A 651 070 09 35
• Fuel type: Diesel
• Part type: Line
• Category: Hoses, Lines & Pipes

Function of the Return Line in a Diesel Fuel System

The return line in a Diesel engine is responsible for draining excess fuel from the injection system components back to the tank. A correctly selected and sealed line:

• stabilizes pressure in the fuel supply system,
• reduces the risk of air entering the system,
• prevents fuel leaks in the engine bay,
• supports uniform operation of the injectors and high-pressure pump.

This ensures the engine runs smoothly, and starting – especially when warm – is more predictable and consistent.

Mercedes Lines, Hoses, and Tubes – Fitment and Compatibility

The offered line belongs to the Lines, Hoses, and Tubes group, meaning it is designed to operate in the demanding environment of the engine bay. The line's construction is adapted to the operating parameters of the diesel fuel system in Mercedes vehicles, considering appropriate resistance to temperature, pressure, and contact with diesel fuel.

For fuel system components, maintaining compliance with the factory routing geometry and connectors used by the manufacturer is crucial. Choosing an original return line helps reduce the risk of leaks, material stress, or improper routing in the engine bay.

Product Characteristics and Application

The fuel return line in this model is designed for use with diesel engines installed in W447 and W906 series vehicles. As a component of the diesel fuel system, it operates continuously, draining excess fuel from precision components such as injectors or the pump, which contributes to their durability and proper lubrication.

The product comes from a used vehicle, which means it is an original part, maintaining factory fitment for the Mercedes fuel system. For many users, this is a cost-effective solution when aiming to preserve the original system configuration while optimizing repair costs.

Benefits of Using an Original Return Line

Using an original return line in a diesel fuel system offers a range of practical benefits:

• Factory Fitment – the line is prepared to work with specific Mercedes engine units, facilitating installation and minimizing the need for modifications.
• Stable Fuel System Operation – proper fuel flow in the return circuit supports uniform rail pressure and improves engine running smoothness.
• Operational Safety – a correctly selected line reduces the risk of fuel leaks, which could lead to unpleasant odors, soiling, or potential fire hazards.
• Economical Repair – a used, original part allows for reduced service costs compared to new aftermarket parts, while maintaining compliance with factory specifications.

Condition, Origin, and Selection of Used Parts

This item comes from the used parts segment, which is a frequently chosen solution for servicing fuel systems in vehicles that are heavily used or have higher mileage. For return lines, it is crucial that they maintain their seal, proper flexibility, and are not mechanically damaged in the connector areas.

If you are considering whether a new or used part would be a better choice for your situation, the following article comparing both options in terms of cost, quality, and durability may be helpful: Car Parts – New or Used? Comparing Costs, Quality, and Durability.

If you are planning a comprehensive repair or upgrade of the fuel system area in your Mercedes and need other components from the same group, such as flexible fuel lines, rigid supply pipes, or return sections, check the available parts in the Mercedes Lines, Hoses, and Tubes category.