Fuel Rail BMW F80 M3 F82 M4 F87 LCI M2 S55 Petrol High Pressure 7848363

Fuel Rail BMW F80 M3 F82 M4 F87 LCI M2 S55 Petrol High Pressure is an original petrol supply system component designed for the S55 engine in BMW M-series sports models. Thanks to its factory design, it ensures proper fuel distribution to the injectors, stable rail pressure, and correct integration with engine peripherals. This is a solution for users who expect consistency with factory specifications and want to maintain the full functionality of the powertrain.

Specifications and technical data

• SKU: 7848363-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7848363
• Substitutable numbers: 7848363, 13537848363
• Fuel type: Petrol
• Category: Additional Fuel Injection Parts

Purpose and function in the injection system

The fuel rail in the S55 engine is responsible for evenly distributing fuel to individual cylinders and maintaining the correct operating parameters of the injection system. In high-power petrol units, such as the F80 M3 and F82 M4, a properly functioning fuel rail is crucial for:

• stable engine operation across the entire rev range,
• precise fuel dosing by the injectors,
• maintaining the correct air-fuel mixture under load,
• safe interaction with the engine control system.

The original fuel rail dedicated to the S55 engine allows for maintaining factory petrol supply parameters, which is important both in daily use and during dynamic driving.

Compatibility with the S55 unit and BMW vehicles

The presented fuel rail has been designed specifically for the S55 engine used in BMW F80 M3 and F82 M4 models. This means it is perfectly matched in terms of:

• geometry and mounting points to the cylinder head and peripherals,
• fuel passages and connection diameters,
• compatibility with the factory control system and sensors.

As a result, installation is straightforward, and the rail performs like a factory component without the need for modifications to the fuel or electrical systems. This is particularly important in high-specification cars, where consistency with the original BMW design affects the reliability of the entire powertrain.

Characteristics of the used component

The offered fuel rail comes from the used parts segment, which allows for an economical restoration of the injection system's efficiency while maintaining original build quality. This type of component is a preferred choice in situations where:

• it is necessary to replace a damaged rail due to mechanical failure or corrosion,
• an S55 unit is being repaired after modifications or an overhaul,
• the user prefers original components over cheap aftermarket replacements.

Choosing a used OEM fuel rail allows you to maintain factory manufacturing standards while reducing service costs compared to a new part from an authorized dealer.

The role of the fuel rail in a petrol engine

In modern petrol units, the fuel rail is one of the key elements of the supply system. In the S55 engine, it is responsible for, among other things:

• maintaining adequate fuel pressure throughout the entire section supplying the injectors,
• stabilizing fuel flow during rapid load changes,
• cooperating with sensors that monitor system operating parameters.

A properly selected fuel rail for a BMW M3/M4 with an S55 engine helps reduce the risk of engine issues such as misfires, rough idling, or power loss at high RPMs. This is especially important in cars driven dynamically, where stability of the petrol supply has a direct impact on performance.

Support with selection and system assembly

When replacing the fuel rail, it is worth verifying the condition of the injectors, fuel lines, and other supply system components to avoid the need for further repairs in the near future. If you are planning a comprehensive repair or upgrade of your BMW's engine area and need other items from the same group, such as fuel lines, injectors, or pressure sensors, check out the available parts in the Other BMW injection system parts category.

If you want to efficiently assemble a larger set of original used components – from engine parts to small mounting accessories – a one-stop-shop guide will be helpful. You can find more practical tips in the article Comprehensive supply: from the engine to the smallest clip – how to assemble used car parts in one place?, which discusses the advantages of choosing verified used parts and how to select them effectively.