Mercedes ML W164 OM642 Fuel Pump Diesel Sender Control Unit A1644702094

Mercedes ML W164 OM642 Fuel Pump Diesel Sender Control Unit is an original fuel system component designed for OM642 diesel engines in the W164 generation ML model. Thanks to its factory design, it ensures stable fuel delivery and proper cooperation with diesel engine accessories, which translates into reliable starting and smooth operation of the power unit.

Specifications and technical data

• SKU: A1644702094
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1644702094
• Substitutable numbers: A1644702094, A 164 470 20 94, A 164 470 03 94, A1644700394
• Fuel type: Diesel
• Category: Fuel Pumps & Sending Units

Purpose and role in the diesel fuel system

The fuel pump in the OM642 diesel engine is responsible for precise supply of the injection system with diesel fuel at the appropriate pressure and with the correct efficiency. In the case of diesel units, proper pump operation is crucial for:

• maintaining stable idle speed,
• correct fuel dosing during acceleration,
• reducing smoke and power drops,
• protecting injectors and other common rail system components.

Choosing a pump dedicated to a specific ML W164 model with an OM642 engine allows you to maintain the factory operating parameters of the power unit and avoid compatibility issues.

OEM design and compatibility

The offered pump belongs to the Fuel pumps and level sensors group, which means it has been designed for integration with the factory fuel supply system and the fuel level monitoring system in the tank. The OEM design ensures:

• appropriate mounting points in the ML W164 body,
• compliance with factory electrical and fuel connectors,
• cooperation with the original OM642 engine control installation.

Thanks to this, the installation proceeds in a predictable manner, without the need for modifications to the installation or the use of adapters, which is particularly important in modern diesel systems.

Operating characteristics in a diesel engine

Diesel engines require the fuel pump to be resistant to high loads and have stable flow characteristics across a wide RPM range. In practice, this means:

• maintaining the appropriate amount of fuel delivered to the injection system under high load,
• proper cooperation with the fuel filter and return lines,
• reducing the risk of system aeration at low fuel levels.

A properly selected diesel fuel pump helps minimize typical signs of wear, such as difficulty starting on a warm engine, power drops, or unstable operation at low RPM.

Condition, origin, and benefits of choosing a used component

The presented fuel pump is an aftermarket part, sourced from the dismantling of a Mercedes vehicle. Choosing a used OEM component allows you to:

• preserve the original build quality characteristic of Mercedes,
• maintain high compliance with the vehicle's factory specification,
• reduce repair costs compared to purchasing a new part.

Before installation, it is recommended to perform a standard verification of the fuel system (line tightness, filter condition, tank cleanliness) to fully utilize the potential of the pump used in the diesel engine.

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 pre-pumps, supply modules, or assemblies integrated with a float, check the available parts in the Mercedes fuel pumps and level sensors category.

Technical support and selection of used components

When selecting used components for modern powertrains, it is worth being guided by compliance with factory specifications and the proven origin of the parts. In the case of electronic and control components, additional guide materials may be helpful – you can find more on this topic in the article Second life of electronics – when is it worth choosing used engine controllers, comfort modules, and parking sensors?.

If you are interested in a broader context of using used components in cars of this brand and want to better plan your repair budget, it is also worth reading the guide used parts for Mercedes – original components from dismantling, which discusses the practical aspects of choosing original elements from the secondary market.