Fuel Filter Pipe Mercedes W164 W221 OM642 Connecting Line Rail A6420707732

Fuel Filter Pipe Mercedes W164 W221 OM642 Connecting Line Rail is an original fuel system component designed for OM642 diesel engines in Mercedes models. Using factory-spec lines from the Lines, hoses and pipes group ensures proper fuel flow, stable pressure, and correct filter operation under demanding operating conditions. This is a solution for users who expect a proven design and compatibility with the factory fuel system.

Specifications and technical data

• SKU: rhd-A6420707732
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6420707732
• Substitutable numbers: A6420707732, A 642 070 77 32
• Fuel type: Diesel
• Category: Hoses, Lines & Pipes

Purpose and function in the fuel system

The fuel filter pipes in a diesel engine are responsible for the safe supply and return of diesel fuel between the filter and other fuel system components. In OM642 units, the correct geometry and diameter of the pipes are essential for:

• maintaining proper fuel flow under variable engine loads,
• stabilizing pressure in the supply circuit,
• reducing the risk of air entering the system,
• maintaining connection tightness over a long period of use.

Thanks to being matched to the specific engine configuration, the fuel filter pipes allow for installation without interfering with the original system, which is important both for standard replacement and for repairs after a failure.

Construction and fitment for the OM642 Diesel engine

The pipe system has been designed to work with Diesel fuel, taking into account the thermal and pressure loads typical for this fuel. The design of the pipes includes:

• routing fuel lines in a way that minimizes mechanical stress,
• using connectors adapted to factory filter ports and engine accessories,
• appropriate bending radii, reducing the risk of kinks and flow restriction.

Such a solution promotes stable system operation across the entire range of RPM and loads, which is important for both the durability of the injectors and the smooth operation of the power unit.

Condition, verification and service application

The item comes from an operated vehicle and is offered as a used part, which allows for economical repair while maintaining the manufacturer's original specifications. This type of component is particularly useful in situations where:

• mechanical damage to the pipes near the fuel filter has occurred,
• there are leaks resulting in air entering the system,
• it is necessary to replace the set of pipes after work in the engine compartment.

Using original pipes from the same model series facilitates installation and reduces the risk of compatibility issues typical of universal-geometry aftermarket parts.

Benefits of using original fuel filter pipes

Choosing Fuel Filter Pipe Mercedes W164 W221 OM642 Connecting Line Rail is a solution that allows you to maintain the consistency of the entire fuel system with factory design assumptions. Key advantages include:

• maintaining the original routing of fuel lines in the engine compartment,
• reducing the risk of leaks thanks to matched connectors,
• the possibility of using the part as a repair element in a professional workshop,
• support for stable diesel engine operation in daily use.

A set of pipes configured in this way will work well both for standard periodic maintenance and for more extensive service work within the fuel system.

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 flexible supply lines, return lines, or breather pipes, check the available parts in the Lines, hoses and pipes Mercedes category.

For drivers considering a wider range of service work on the powertrain, including potential replacement of transmission components, a guide on the cost-effectiveness of purchasing used subassemblies may be helpful – more information can be found in the article Used gearbox – when is it worth it and what you need to remember.