Mercedes W169 W245 OM640 Fuel Hose Line High Pressure Pump A6400780781

Mercedes W169 W245 OM640 Fuel Hose Line High Pressure Pump is a precision component of the diesel fuel supply system, designed specifically for diesel engines. As part of the Lines, Hoses and Pipes group, it ensures a leak-proof and stable fuel delivery to the high-pressure pump, which translates into proper diesel engine operation and consistent injection parameters.

Specifications and technical data

• SKU: RHD-A6400780981
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6400780981
• Substitutable numbers: A6400780981, A 640 078 09 81
• Fuel type: Diesel
• Category: Hoses, Lines & Pipes

Purpose and function in the fuel system

The high-pressure line in question is a component connecting the fuel supply system to the injection pump in the OM640 engine used in Mercedes A-Class W169 and B-Class W245 models. In a diesel engine, maintaining proper fuel pressure is crucial, which is why stable diesel fuel delivery to the pump has a direct impact on the engine's refinement, dynamics, and exhaust emissions.

The line has been designed to operate under high-pressure conditions characteristic of modern injection systems, with an emphasis on resistance to pressure pulsations, vibrations, and temperature changes in the engine compartment. This reduces the risk of micro-leaks, pressure drops, and starting problems.

Construction and performance parameters

As an item from the Lines, Hoses and Pipes category, the high-pressure line for the injection pump in the OM640 features a design adapted to the specifics of a diesel unit. The connection ends are matched to the ports in the pump and other system elements, which allows for secure, repeatable tightening and maintenance of tightness over a long service life.

The line is intended for use with Diesel fuel, which means appropriate material resistance to diesel fuel and additives. The design takes into account typical operating loads in Mercedes A-Class and B-Class vehicles, including vibrations transmitted from the power unit and variable thermal conditions.

Use in diagnostics and repairs

Replacing the high-pressure line is recommended in situations where symptoms such as fuel leaks near the pump, power drops, unstable idle speed, or difficulties starting a warm engine occur. Using an original solution dedicated to the OM640 allows for restoring correct pressure parameters in the system and limiting the risk of secondary damage to injection components.

A used part can be an attractive cost-effective alternative while maintaining assembly compatibility and the correct geometry of the line. This is particularly important in the case of precision common rail systems, where accurate fit of the line's shape and length affects proper routing and stress relief of the connectors.

Benefits of using an original Mercedes line

Using an original high-pressure line dedicated to the OM640 engine in the Mercedes W169/W245 ensures:

• reliable compatibility with the diesel engine fuel system,
• preservation of the factory routing of the line in the engine compartment,
• appropriate resistance to operating pressure and pulsations in the injection system,
• reduced risk of leaks and fuel pressure drops.

For users looking for more detailed information on the advantages of using original components, material describing the importance of OEM parts and the safety of their use in vehicles may be helpful. You can find more on this topic in the article Quality assurance and OEM safety – why are used original car parts the best choice for your car?.

Integration with other fuel system components

The high-pressure line works with the injection pump, common rail, and injectors, creating a coherent supply system in a diesel engine. During repairs, it is worth paying attention to the condition of other fuel lines and pipes to avoid a situation where a new element works in an environment of worn-out components.

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 supply lines, discharge lines, or return pipes, check the available parts in the Mercedes Lines, Hoses and Pipes category.

Summary

Mercedes W169 W245 OM640 Fuel Hose Line High Pressure Pump is an essential element of the fuel supply system in the Mercedes W169 and W245 with a diesel unit. A properly selected, original line allows for maintaining the correct fuel pressure, supports stable engine operation, and limits the risk of failures related to leaks or drops in injection parameters. It is a reasonable choice for repairs and servicing of the fuel system in Mercedes cars with this type of power unit.