Mercedes W169 W245 Diesel High Pressure Fuel Injection Pump Unit A6400700701

Mercedes W169 W245 Diesel High Pressure Fuel Injection Pump Unit is a precision fuel system component designed for diesel engines in compact Mercedes models. It ensures stable high-pressure fuel generation, which translates into smooth engine operation and correct injection dosage. This is a solution for users who are looking for a proven, factory-matched high-pressure pump instead of random replacements.

Specifications and technical data

• SKU: A6400700701-3
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6400700701
• Substitutable numbers: A6400700701, A 640 070 07 01, BG
• Fuel type: Diesel
• Category: Fuel Pumps & Sending Units

Purpose and role in the fuel system

The described high-pressure pump is a component from the Fuel pumps and level sensors group, responsible for delivering diesel fuel to the injection rail at a sufficiently high pressure. In compact Mercedes vehicles, such as the W169 and W245, the correct operation of this subassembly is crucial for:

• stable diesel engine starting in various temperatures,
• maintaining proper pressure in the common rail,
• reducing smoke and power drops under load,
• precise fuel dosing by the injectors. Thanks to a design that complies with the vehicle manufacturer's requirements, the pump works with the factory control electronics and injection system without the need for modifications.

Compatibility with Mercedes diesel engines

The pump has been designed to work in Diesel engines used in Mercedes W169 and W245 models, which means maintaining the appropriate operating pressure parameters and fuel flow characteristics. Using parts from the same design family allows you to:

• maintain the factory performance of the engine,
• minimize the risk of engine control unit errors related to fuel pressure,
• maintain proper cooperation with existing injectors and accessories. This is particularly important in modern common rail systems, where even small deviations in pump parameters can cause uneven engine operation or trigger limp mode.

Performance characteristics and benefits of use

Choosing an original high-pressure pump from the Mercedes group is a solution that technically and operationally outperforms many random replacements. The most important benefits include:

• factory fit for the fuel system – no need for mechanical or electrical adaptation,
• maintaining the correct pressure characteristics across the full RPM range,
• consistency with factory injection maps stored in the engine control unit,
• the ability to use existing service infrastructure (diagnostics, assembly procedures). For workshops and users, this means shorter assembly time, lower risk of problems after replacement, and easier diagnostics if needed.

Condition, verification, and preparation for installation

The item comes from a used vehicle, which allows for a favorable cost-to-functionality ratio while maintaining the manufacturer's original specifications. These types of pumps are often chosen in situations where compatibility with the factory system and the ability to perform further diagnostics using standard service tools are important. Before installation, it is recommended to:

• check the fuel system for leaks after installation,
• bleed the system according to the procedure for the specific engine,
• verify pressure parameters on a diagnostic tester after the first start-up.

Technical support and additional information

If you are planning a comprehensive repair or upgrade of the fuel supply area in your Mercedes and need other elements from the same group, such as low-pressure pumps, fuel modules, or level sensors, check the available parts in the Mercedes fuel pumps and level sensors category. When working with fuel systems and body components, it is worth paying attention to the quality of used parts – in the case of windows and glass elements, you will find practical tips in the article Spider crack on the windshield? Why it is better to choose a used original with the manufacturer's logo when replacing, which discusses, among other things, the selection of original components and checking their condition before installation.