Mercedes W164 OM642 Fuel Overflow Leakoff Hose Line Pipe A6420703032

Mercedes W164 OM642 Fuel Overflow Leakoff Hose Line Pipe is an original diesel fuel system component designed for OM642 diesel engines in W164 series models. Thanks to its factory geometry and precise fitment to the injection system, it ensures stable fuel delivery and maintains the engine's performance parameters. This is the ideal solution for users looking for a proven, compatible fuel hose for their Mercedes.

Specifications and technical data

• SKU: A6420703032
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6420703032
• Substitutable numbers: A6420703032, A 642 070 30 32
• Fuel type: Diesel
• Category: Fuel Tanks & Filler Necks

Purpose and function in the fuel system

The fuel hose in the OM642 diesel engine is responsible for the controlled transport of diesel fuel between fuel system components, such as the pump, rail, and other sections of the installation. The proper cross-section and rigidity of the hose limit pressure drops and the risk of cavitation, which translates into smooth engine operation, correct injection doses, and stable cold starts.

For Mercedes diesel units, a correctly selected fuel hose is essential for:

• maintaining fuel system tightness at high operating pressures,
• reducing the risk of air entering the system,
• limiting vibrations and stress within the engine accessories,
• preserving the factory performance parameters of the injection system.

Compatibility with the OM642 diesel engine

The offered hose has been designed to work with the OM642 diesel engine used in the Mercedes W164. This ensures compatibility with the factory installation routing, mounting points, and pressure requirements characteristic of this system. Using a hose dedicated to a specific engine unit minimizes the risk of leaks, collisions with other engine bay components, and improper hose positioning.

In practice, this translates into easier installation, no need for modifications, and the preservation of the original fuel system architecture, which is particularly important when servicing modern Mercedes diesels.

Characteristics of the used component

The fuel hose comes from the secondary market, which allows for economical repair while maintaining the original manufacturer's specifications. A used component is a good solution in situations where you want to maintain the factory design while reducing costs compared to new parts. This type of hose is particularly useful for comprehensive fuel system repairs, replacing damaged sections of the installation, or restoring the vehicle to its original design state.

Why it is worth using an original fuel hose

Using a fuel hose dedicated to the Mercedes W164 with an OM642 engine allows you to maintain the integrity of the entire fuel system. Compared to universal replacements, the original component provides:

• proper fitment to factory brackets and installation routing,
• compliance with common rail system pressure requirements,
• lower risk of leaks and abrasions resulting from improper positioning,
• easier diagnostics and future service.

For workshops and private users, this means more predictable installation and a reduction in potential operational problems related to the fuel system.

Technical support and knowledge about the fuel system

If you want to better understand how the fuel hose works with the pump, injectors, and tank, and how to select components by OEM numbers, it is worth checking out our expert material. A detailed discussion of construction, diagnostics, and regeneration can be found in the article Fuel system – injectors, pumps, and fuel tank: maintenance and regeneration, which will help in the informed servicing of modern diesels.

If you are planning a comprehensive repair or upgrade of the fuel system area in your Mercedes and need other elements from the same group, such as hoses, filler pipes, or components near the tank, check out the available parts in the Mercedes fuel tanks and filler pipes category.