Relay Mercedes W124 E280 Petrol Fuel Pump Cut Off Relay A0035452405

Relay Mercedes W124 E280 Petrol Fuel Pump Cut Off Relay is a specialized component from the Relays category, designed for the petrol fuel system in this classic Mercedes model. It is responsible for the stable control of the fuel pump operation, which translates into reliable starting, smooth engine performance, and safe power supply to the powertrain. Thanks to its design, which complies with factory Mercedes standards, this relay provides a functional service solution for vehicles with a petrol engine.

Specifications and technical data

• SKU: A0035452405
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A0035452405
• Substitutable numbers: A0035452405, A 003 545 24 05
• Fuel type: Petrol
• Category: Relays

Purpose and function in the fuel system

The fuel pump relay in a Mercedes W124 E280 running on petrol is a key component controlling the power supply to the in-tank pump. It is responsible for:

• activating the fuel pump during engine start-up,
• maintaining continuous fuel supply while the engine is running,
• cutting off the pump power supply in emergency situations in accordance with the vehicle's control logic.

A functional relay reduces the risk of starting problems, engine stalling under load, and unstable operation of the injection system.

Benefits of using an original Mercedes relay

Using a relay dedicated to the Mercedes W124 E280 ensures proper electrical and mechanical compatibility with the vehicle's installation. In practice, this means:

• proper cooperation with the factory wiring harness and mounting socket,
• appropriate current and timing characteristics for fuel pump activation,
• maintaining the operating parameters specified by the vehicle manufacturer.

For cars with a petrol engine, fuel supply stability is particularly important, which is why choosing the right relay has a direct impact on the engine's refinement and operational safety.

Product condition and service application

The offered fuel pump relay is an aftermarket component, which allows for an economical repair of the fuel system while maintaining compatibility with the Mercedes design. This type of part is suitable both for the typical replacement of a worn-out relay and for diagnosing fuel supply problems when it is necessary to substitute a functional component in place of the existing one.

Replacing the relay is usually a service task of moderate difficulty; however, for full confidence in the fuel system's operation, installation by a person with experience in working with Mercedes vehicle electrical systems is recommended.

Selecting the relay for a specific vehicle

To correctly select a fuel pump relay for your Mercedes W124 E280, it is worth verifying the part's compatibility with the vehicle documentation and the markings used on the factory module. The product has an OEM part number and interchangeable numbers, which facilitates matching to the specific car configuration and minimizes the risk of installing an incorrect component.

For petrol-powered vehicles, it is particularly important that the relay is intended specifically for this type of fuel, which ensures the appropriate operating characteristics in conjunction with the injection system and engine control unit.

System expansion and other Mercedes relays

If you are planning a comprehensive repair or upgrade of the electrical installation area responsible for power supply and control in your Mercedes and need other components from the same group, such as control modules, additional relays, or current protection elements, check the available parts in the Mercedes Relays category.

For those interested in deepening their knowledge about the structural differences between classic and newer automotive solutions and the role of original components in preserving a vehicle's character, the following article may be helpful: Classic Mini vs modern MINI – how the design has changed and which original Mini parts help preserve their character.