Fuel Rail BMW F40 F44 Mini F55 F56 High Pressure Injection Rail Sensor 8665633

BMW F40 F44 Mini F55 F56 Gasoline Fuel Rail Sensor is an original gasoline fuel system component designed for modern BMW F-series and Mini models. The complete fuel rail with pressure sensor ensures stable fuel supply and precise control of engine operating parameters, contributing to efficient vehicle operation.

Specifications and technical data

• SKU: 8665633-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 8665633
• Substitutable numbers: 8665633, 13538665633
• Fuel type: Petrol
• Category: Fuel Injectors

Purpose and Function in the Injection System

The fuel rail integrated with a sensor is a key component of the fuel system in BMW and Mini gasoline engines. It is responsible for uniform fuel distribution to the injectors and continuous pressure measurement in the fuel rail, enabling the engine control unit to precisely dose gasoline under all load conditions.

In BMW F40, F44, and Mini F55, F56 vehicles, a properly functioning fuel rail with a sensor directly impacts:

• stable idle operation and during acceleration,
• proper throttle response without jerking or power loss,
• maintaining the correct fuel-air mixture, which supports engine and component longevity.

Application in BMW F40, F44, and Mini F55, F56 Models

The presented fuel rail is designed to work with gasoline engines on the BMW F40, F44, and Mini F55, F56 platforms. As such, it is a dedicated solution for this generation of vehicles, maintaining factory mounting points and fuel system geometry.

Selecting the component according to the manufacturer's designations ensures:

• full compatibility with the factory engine control unit,
• compliance with original injection components (injectors, high-pressure lines),
• consistency of operating parameters with manufacturer-specified injection maps.

Technical Characteristics and Sensor Role

The fuel rail belongs to the Injector Nozzles category, but in this case, it functions as a central fuel manifold with a built-in sensor. The pressure sensor transmits information about the current rail pressure to the control unit, enabling:

• dynamic fuel delivery correction based on load and engine speed,
• monitoring of potential pressure drops related to pump operation or leaks,
• diagnostics of injection system faults through error logging in the ECU memory.

This solution is particularly important in modern gasoline engines, where injection control precision affects not only performance but also emissions and fuel consumption.

Condition, Origin, and Benefits of Choosing a Used Part

The offered fuel rail with sensor is an original BMW part from disassembly, in used condition. Such components from the aftermarket are often chosen by informed users because they:

• retain factory manufacturing quality and fit for the specific engine,
• allow for reduced repair costs compared to purchasing a new part,
• minimize the risk of compatibility issues typical of cheaper aftermarket alternatives.

Before installation, standard fuel system inspection and computer adaptation/diagnostics are recommended to confirm proper cooperation of the fuel rail with the existing engine control unit.

Fault Diagnostics and Technical Knowledge

Problems with the fuel rail or pressure sensor can manifest as, among other things, uneven engine operation, power loss, or the illumination of the engine warning light. Although the presented component applies to gasoline engines, many diagnostic principles for injection systems are common across different fuel types. It is worth familiarizing yourself with material discussing typical symptoms and consequences of neglect, such as the guide on diesel injector faults – symptoms, consequences, and diagnostics, which helps to better understand the operating logic of modern injection systems.

Related Products and Further System Expansion

If you are looking for other components from the BMW injector nozzles category for your vehicle, check out our dedicated offer: BMW injector nozzles. There you will find a wide selection of injection system components tailored to various models and generations.

When planning a fuel system repair or upgrade, it is also worth considering the use of used control modules and sensors. More practical information on this topic can be found in the article why choose used ECU modules and sensors in a car, which discusses selection by manufacturer numbers, compatibility issues, and examples of applications in real repairs.