Fuel Hose Mercedes W169 W245 OM640 Fuel Filter Pump Line Pipe Diesel A6400700881

The Mercedes W169 W245 OM640 Fuel Line is an original component of the diesel engine's fuel supply system, designed for use with Diesel fuel. Engineered by the vehicle manufacturer, it ensures proper fuel delivery between the filter and the pump, contributing to stable engine operation and safe system pressure. This is a practical service solution for owners of A-Class and B-Class models with the OM640 engine.

Specifications and technical data

• SKU: rhd-A6400700881
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6400700881
• Substitutable numbers: A6400700881, A 640 070 08 81
• Fuel type: Diesel
• Category: Hoses, Lines & Pipes

Purpose and Function in the Fuel System

The fuel line in this configuration is responsible for precisely delivering diesel fuel between the fuel filter and the pump, in accordance with the design requirements of the OM640 engine. The appropriately selected inner diameter and shape of the line minimize pressure drops and the risk of air ingress, which is crucial for easy starting and smooth operation of the diesel unit.

This component belongs to the Lines, Hoses, and Tubes group, making it compatible with the factory-installed routing in the engine bay and eliminating the need for modifications to mountings or brackets. Using an original solution ensures compliance with the manufacturer's design and avoids problems typically associated with aftermarket alternatives of incorrect geometry.

Construction and Fitment for Mercedes W169 / W245

The line has been specifically designed for Mercedes A-Class (W169) and B-Class (W245) models with the OM640 engine, ensuring a perfect fit with the factory fuel system and existing mounting points. The shape and length of the line are tailored to the routing within the engine bay, facilitating installation and minimizing material stress during operation.

The original ends of the line are designed to connect with the factory fuel filter and pump spigots, promoting sealed connections and reducing the risk of leaks. This allows the line to be used as a direct replacement for a worn component without the need for additional adapters.

Operating Parameters with Diesel Fuel

The fuel supply system in diesel engines operates under elevated pressure and temperature demands, requiring the fuel line to be resistant to prolonged contact with diesel fuel. The construction of this component is adapted to the specific properties of Diesel fuel, including resistance to its chemical characteristics and temperature fluctuations within the engine bay.

Using a line designed for a specific fuel type minimizes the risk of swelling, micro-cracks, and leaks, which could lead to pressure drops, starting problems, or unstable engine operation. This is particularly important in modern diesel engines where the fuel system is precisely calibrated.

Service Application and Installation Benefits

Replacement of the fuel line is recommended in cases of detected leaks, corrosion on connections, mechanical damage, or after interventions in the fuel system. Using an original line in Mercedes W169 and W245 vehicles with the OM640 engine restores proper fuel flow and reduces the risk of failures related to air ingress or leaks.

Key benefits of installation include:

• maintaining the original line routing geometry in the engine bay,
• proper fitment to fuel filter and pump spigots,
• suitability for use with Diesel fuel,
• applicability within standard service procedures.

Complementary Mercedes Fuel System Components

If you are planning a comprehensive repair or engine bay upgrade for your Mercedes and require other components from the same group, such as additional supply lines, return hoses, or vent tubes, please check the available parts in the Mercedes Lines, Hoses, and Tubes category.

Technical Support and Service Knowledge

When planning work on the fuel system, it is advisable to consult reliable sources of information regarding vehicle component operation and refurbishment. For users interested in a broader perspective on used parts and their restoration, the guide article Used Wheels Like New: A Guide to Buying and Refurbishing Alloy Wheels may be helpful, demonstrating how to approach component selection and renovation consciously.