BMW E60 E61 E83 E90 E91 Fuel Rail M57N2 High Pressure Fuel Rail 7805727

The BMW E60 E70 E83 E90 M57N2 Diesel Fuel Rail is a fuel system component designed for BMW diesel engines from the M57N2 family. It is responsible for the stable distribution of fuel to the common rail injectors, which directly impacts the engine's running smoothness, performance, and operational safety.

Specifications and technical data

• SKU: 7805727-2
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7805727
• Substitutable numbers: 7805727, 13537805727, 7795514, 13537795514
• Category: Fuel Injectors

Purpose and Role in the Injection System

The diesel fuel rail for BMW E60, E70, E83, and E90 operates within the common rail system, serving as a high-pressure collective manifold. Its function is to supply all injectors evenly, ensuring the M57N2 engine maintains stable fuel pressure across a wide range of loads.

A correctly selected fuel rail helps to:

• maintain stable fuel pressure across the entire RPM range,
• limit injection quantity fluctuations, resulting in smoother engine operation,
• reduce the risk of uneven engine running and power drops during dynamic acceleration.

Compatibility with M57N2 Engine

This fuel rail is designed for BMW M57N2 diesel units installed in the E60, E70, E83, and E90 series. Proper matching to the specific engine version and vehicle generation is crucial for maintaining correct injection system operation and compliance with the factory engine control unit characteristics.

By using an original BMW solution from the injector nozzles category, the factory geometry and high-pressure line connection method are preserved, facilitating installation and reducing the risk of leaks.

Benefits of Using an Original Fuel Rail

Choosing a fuel rail dedicated to the M57N2 engine allows for the maintenance of performance parameters close to factory specifications. This is particularly important for vehicles used daily, where predictability and repeatability of the powertrain's behavior are key.

• Better injector cooperation – proper pressure distribution in the manifold promotes even fuel delivery.
• Stable idle operation – reduced pressure fluctuations translate to smoother engine running at low RPMs.
• Appropriate response to load – during sudden acceleration, the rail helps maintain the required pressure for the set fuel quantity.

Condition and Service Application

This component is from the BMW offering and is intended for service applications in vehicles with the M57N2 engine experiencing injection system problems, such as power loss, starting difficulties, or uneven running under load. Replacing the fuel rail is one of the steps that can be considered after prior diagnosis of fuel pressure and injectors.

Before installation, a full common rail system diagnosis is recommended to confirm the necessity of replacement and to rule out other components, such as the high-pressure pump or the injectors themselves.

Technical Support and Additional Materials

If you want to better understand how fuel system problems manifest in diesel engines, the article describing diesel injector faults, their symptoms, and the consequences of neglect will be helpful. This provides practical knowledge for planning repairs to the common rail system in BMWs with the M57N2 engine.

If you are looking for other components in the injector nozzles for BMW category, check out our offer, where you will find a wide selection of such components: BMW injector nozzles.