BMW F20 F30 LCI F32 M140i 340i 440i Petrol B58 High Pressure Rail Fuel 7643082

The BMW F20 F30 M140i 340i 440i Fuel Rail is an original gasoline direct injection system component designed for modern BMW engines. The rail ensures a stable supply of gasoline to the injectors at the correct pressure, which translates to precise fuel delivery and proper engine operation.

Specifications and technical data

• SKU: 8665635
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 8665635
• Substitutable numbers: 13538665635, 8665635, 13537643082, 7643082
• Fuel type: Petrol
• Category: Fuel Injectors

Purpose and Function in the Fuel System

The fuel rail in BMW F-series models with M140i, 340i, and 440i engines plays a crucial role in distributing fuel to individual cylinders. In conjunction with precise gasoline injectors, it is responsible for:

• stable fuel pressure across the entire engine load range,
• uniform fueling of all cylinders, which reduces the risk of knocking and uneven engine operation,
• efficient gasoline utilization, contributing to the maintenance of factory performance and smooth running.

A properly selected fuel rail is particularly important in powerful, turbocharged gasoline engines where the fuel system operates under high load and requires maintaining appropriate flow parameters.

Construction and Compatibility with Gasoline Engines

The presented BMW fuel rail is designed to work with the gasoline injection system in modern BMW engines. The component's construction is optimized for:

• precise fuel delivery to the injector ports,
• rigidity and vibration resistance, which minimizes micro-leaks and pressure fluctuations,
• correct injector positioning relative to the cylinder head and combustion chamber.

Thanks to its original manufacturing, the rail retains its original geometry and mounting points, facilitating installation in the engine bay without the need for modifications to the fuel system or brackets.

Benefits of Using an Original Fuel Rail

Using an original fuel rail in a BMW gasoline engine allows for maintaining the unit's operating parameters at the level intended by the manufacturer. The most significant benefits include:

• maintaining factory fueling characteristics – correct pressure and fuel distribution in the rail,
• improved idle stability and performance during rapid load changes,
• reduced risk of engine control unit errors related to incorrect fuel pressure,
• compatibility with original injector nozzles and fuel system accessories.

For high-performance engines such as the M140i, 340i, or 440i, the appropriate fuel rail directly impacts engine durability, proper mixture combustion, and performance consistency.

Condition, Verification, and Service Application

The offered rail belongs to the category of Injector Nozzles, meaning it is a component that directly interacts with precise injection system sub-assemblies. Before reinstallation in the vehicle, it is recommended to:

• check the fuel system for leaks after installation,
• inspect the condition of the injector seats and seals,
• perform a computer diagnostic scan for any fuel pressure-related errors.

This approach helps to minimize the risk of leaks, difficult starting, or power loss after replacing a fuel system component.

Related Components and Technical Knowledge

If you are looking for other components in the BMW injector nozzles category, check out the BMW injector nozzles available in our store to find a complete solution for your engine.

When diagnosing fuel injection system problems, it is useful to know the typical symptoms of damage. Although the presented rail works with gasoline engines, many principles of injection diagnostics are similar to those for diesel engines – you can find more practical information in the article Diesel Injector Faults – How to Recognize Them and What Their Neglect Entails, which discusses symptoms, consequences, and basic diagnostics of injection systems.