Mercedes W205 M274 Petrol Fuel Rail Injection Injector A27407800

Mercedes W205 M274 Petrol Fuel Rail Injection Injector is an original fuel system component designed for precise fuel delivery at the required pressure. Thanks to its factory design, it ensures stable engine operation and correct injection characteristics, which translates into smooth engine performance and proper power output. This solution is dedicated to users who want to maintain consistency with Mercedes factory specifications when repairing or replacing fuel injection system components.

Specifications and technical data

• SKU: A2740700995-2
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2740700995
• Substitutable numbers: A27407800
• Fuel type: Petrol
• Category: Additional Fuel Injection Parts

Purpose and function in the injection system

The described fuel rail with injectors is a component of the petrol supply system in Mercedes C-Class W205 generation models with the M274 engine. It is responsible for the even distribution of fuel to individual cylinders and maintaining the correct operating pressure throughout the system. A properly selected fuel rail is crucial for:

• stable engine operation across the entire rev range,
• correct fuel dosing by the injectors,
• maintaining the proper air-fuel mixture composition,
• reducing fuel consumption and exhaust emissions.

Thanks to a design consistent with Mercedes factory standards, the rail works with the original engine control unit and other injection system components without the need for modifications.

Technical characteristics and compatibility

The fuel rail has been designed for operation in a petrol engine, which means it is adapted to the pressure and flow parameters typical for spark-ignition units. The element is part of the Other injection system parts group, which in practice means it performs a specialized function within the fuel supply system, working in conjunction with the high-pressure pump, fuel lines, and the engine control unit.

Its original Mercedes origin ensures full geometric compatibility (mounting points, injector spacing, fuel connections) and electrical compatibility (injector connectors, operating parameters). As a result, installation is similar to factory service, without the need for adaptations or alterations.

Component condition and service application

The product comes from the secondary market, making it an attractive solution for users looking for a balance between repair costs and maintaining the manufacturer's original specifications. This type of fuel rail with injectors is particularly useful in situations where:

• mechanical damage to the existing rail has occurred (e.g., cracks, leaks),
• there are problems with uneven engine operation related to the injection system,
• it is necessary to replace the complete injection assembly instead of individual components.

Choosing an original component from dismantling allows for maintaining operating parameters close to factory levels while reducing costs compared to purchasing a new part.

Benefits of using an original fuel rail

Using a factory fuel rail with injectors in a Mercedes W205 with an M274 engine offers a number of practical benefits:

• Consistency with the factory design – maintaining original injection characteristics and ECU compatibility.
• Reduced risk of fitment issues – no need for modifications to mounts or electrical wiring.
• Possibility of economical repair – especially important for comprehensive work within the petrol supply system.
• Stable engine operation – a properly functioning fuel rail promotes smooth engine performance and correct throttle response.

Expansion of service work and additional materials

If you are planning a comprehensive repair or upgrade of the engine area in your Mercedes and need other elements from the same group, such as additional fuel rails, fuel lines, or supply components, check the available parts in the Other injection system parts Mercedes category.

When planning repairs using secondary market components, it is worth knowing the best practices for selecting and installing used parts – we discuss this in more detail in the article Audi on second-hand parts – tuning and repairs without losing quality, which shows how to reasonably use used components in premium class cars.