Mercedes W203 M111 Petrol Fuel Pump Sender Unit Level Sensor A2034700041

Mercedes W203 M111 Petrol Fuel Pump Sender Unit Level Sensor is an original fuel system component designed for M111 petrol engines. It ensures precise fuel level measurement in the tank and stable power supply to the engine unit, which translates into reliable fuel system operation and correct readings on the instrument cluster. This is an OEM solution that allows you to maintain the factory performance characteristics of the fuel system in your Mercedes.

Specifications and technical data

• SKU: A2034703594
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2034703594
• Substitutable numbers: A2034703594, A 203 470 35 94, A2034700041, A 203 470 00 41
• Fuel type: Petrol
• Category: Fuel Pumps & Sending Units

Purpose and function in the fuel system

The presented fuel pump assembly with a level sensor is dedicated to Mercedes C-Class W203 generation models with an M111 petrol engine. The component is responsible for both pumping fuel from the tank to the fuel rail and measuring the fuel level, which is transmitted to the gauge. Thanks to this, the driver receives stable, repeatable readings, and the engine unit is provided with the appropriate supply pressure across the entire load range.

Construction of the pump and level sensor assembly

The assembly belongs to the Fuel pumps and level sensors group, which means that several key fuel system components have been integrated into one housing. The design includes:

• a fuel pump module responsible for pumping petrol from the tank,
• a float assembly with a potentiometer that performs fuel level measurement,
• fuel and electrical connections allowing for integration with the vehicle's factory wiring.

Such a solution facilitates service and replacement – instead of interfering with several separate components, the mechanic installs a complete module, maintaining the factory geometry and mounting points.

Benefits of using an original Mercedes module

Using an original module in a Mercedes W203 with an M111 engine allows you to maintain fuel system operating parameters in accordance with the manufacturer's specifications. The most important advantages include:

• Factory electrical and hydraulic compatibility – the module works with the original wiring harness and fuel lines without the need for modifications.
• Stable petrol engine power supply – properly selected pump efficiency reduces the risk of pressure drops under higher loads.
• Precise fuel level reading – the correct sensor characteristics ensure predictable behavior of the gauge on the dashboard.
• Reduction of diagnostic problems – using an OEM component facilitates the work of diagnostic systems and the engine control unit.

Condition, selection, and service application

The item comes from dismantling and is offered as a used OEM module, which is a cost-effective solution for maintenance repairs and restoring the efficiency of older Mercedes W203 vehicles. It is particularly useful in situations where symptoms such as starting difficulties, engine misfiring at low fuel levels, or unstable fuel level readings on the gauges occur.

Part selection should be based on the OEM number or interchangeable numbers assigned to a specific engine version and vehicle year. This avoids mechanical and electrical compatibility issues and speeds up the installation process in the vehicle.

Technical support and additional resources

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 pump modules, level sensors, or complete tank basket assemblies, check the available parts in the Mercedes fuel pumps and level sensors category.

To better understand the principles of fuel system operation, diagnostic methods, and component selection by OEM number, it is worth reading the guide article Fuel system – injectors, pumps, and fuel tank: maintenance and regeneration, which discusses practical aspects of operating and servicing fuel pumps and level sensors.