Mercedes-Benz ML W164 Diesel Fuel Tank Feed Return Inlet Outlet Line Set

Mercedes-Benz ML W164 Diesel Fuel Tank Feed Return Inlet Outlet Line Set is an original fuel system component designed for use with a diesel fuel tank. It ensures a leak-proof fuel flow between the tank and other components, which translates into stable engine operation and correct system pressure.

Specifications and technical data

• SKU: A1644706464
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1644706464
• Substitutable numbers: A1644706464, A 164 470 64 64, A1644706664, A 164 470 66 64, BG
• Fuel type: Diesel
• Category: Fuel Tanks & Filler Necks

Purpose and function in the fuel system

This line set is part of the Fuel tanks and filler pipes category and is responsible for the safe supply and return of diesel fuel from the tank in the Mercedes ML-Class W164 generation. The design of the lines is adapted for use with Diesel fuel, which means resistance to the specific properties of diesel oil and the typical operating pressures in this system.

A properly selected set of lines minimizes the risk of leaks, air in the system, or pressure drops, which can cause starting problems, uneven engine operation, or power loss. Using an original solution dedicated to the ML W164 facilitates installation and allows for maintaining the factory geometry of the fuel line routing.

Set construction and key technical features

The set includes supply and return lines routed from the fuel tank, with appropriately shaped sections and connectors for the Mercedes ML W164 system. The lines are adapted for operation in the chassis compartment, where they are exposed to temperature changes, moisture, and road debris.

• dedicated geometry for the ML W164 body – fitment to factory mounts and brackets,
• adapted for Diesel fuel – material resistance to diesel oil,
• integrated supply and return sections – organized fuel routing to and from the tank,
• original Mercedes solution – compatibility with the factory fuel system.

Thanks to this set, you can restore the correct routing of fuel lines after bodywork repairs, mechanical damage, or corrosion of old lines.

Condition, origin, and practical application

The item comes from dismantling and is offered as a used original Mercedes component, which in practice means maintaining factory specifications at a more favorable cost compared to a new part. This is a particularly beneficial solution for comprehensive fuel system repairs, where both quality and service economy matter.

The use of this line set is recommended, among others, in situations of:

• mechanical damage to the lines (e.g., after a collision or underbody impact),
• detection of leaks or corrosion of metal line sections,
• modernization or replacement of the fuel tank in an ML W164 with a diesel engine.

Selection by numbers and technical support

The set of lines is assigned to a specific OEM reference and has interchangeable numbers, which facilitates precise identification of the part by catalog or by the numbers of the dismantled element. Before purchasing, it is worth comparing the markings with the vehicle documentation or the numbers from the existing fuel system to ensure full compatibility with the specific version of the ML W164.

For users who want to better understand the operation of the fuel system in diesel cars, a guide describing diagnostics, selection by VIN/OEM, and operating principles will be useful – you can find it in the article Fuel system – injectors, pumps, and fuel tank: maintenance and regeneration.

Integration with other Mercedes fuel system components

Replacing the fuel supply and return lines is often associated with work on the tank, filler, and mounting elements. If you are planning a comprehensive repair or modernization of the fuel system area in your Mercedes and need other elements from the same group, such as a fuel tank, filler pipe, or additional vent lines, check the available parts in the Mercedes fuel tanks and filler pipes category.

If you are considering whether a used or regenerated part is a better choice, comparing both solutions in terms of durability and cost-effectiveness, described in the material Regenerated or used original – which part to choose for repairs?, may be helpful.

Summary

Mercedes-Benz ML W164 Diesel Fuel Tank Feed Return Inlet Outlet Line Set is a practical solution for owners of diesel-powered cars who want to restore the efficiency of the fuel system while maintaining the manufacturer's factory concept. The original design, fitment to the W164 body, and suitability for Diesel fuel make it a reasonable choice for repairs and upgrades in this Mercedes series.