BMW E39 E46 Injector Rail Injectors 1427335

The BMW E39 E46 Fuel Rail is an original fuel supply system component designed for BMW 3 Series E46 and 5 Series E39 engines. The rail ensures stable fuel delivery to the injectors, which translates to smooth engine operation and proper response to load.

Specifications and technical data

• SKU: 1427335
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 1427335
• Substitutable numbers: 1427335, 13531427335
• Category: Fuel Injectors

Purpose and Role of the BMW Fuel Rail

The BMW E39 E46 Fuel Rail operates at the central point of the fuel supply system, distributing fuel to individual injectors. A correctly selected rail allows for:

• stable fuel pressure across the entire engine RPM range,
• uniform fueling of all cylinders, which reduces vibrations and uneven engine operation,
• the correct fuel dose required by the engine control unit.

Replacing a worn or damaged rail is crucial for issues with starting, power loss, jerking under load, or unstable idle speed.

Construction and Fitment for BMW E39 / E46

The offered rail is from the group of original BMW components, meaning it retains the factory geometry, mounting spacing, and connections for injectors and fuel lines. Thanks to this:

• it fits the factory mounting points in the engine bay of E39 and E46 models,
• it ensures compatibility with stock injectors used in these powertrains,
• it facilitates plug-and-play installation, without the need for fuel system modifications.

Such a fit is particularly important in cars where maintaining the original engine characteristics and compliance with factory control unit maps is essential.

Component Condition and Service Application

The fuel rail is in used condition, allowing for an economical repair of the fuel supply system while maintaining the original manufacturer's specifications. This solution is often chosen for:

• injector refurbishment or replacement, when the old rail shows signs of mechanical damage,
• diagnosing fuel supply problems, where a functional component needs to be substituted,
• restoring the car to factory condition after previous fuel system modifications.

Selecting a rail that matches the manufacturer's markings minimizes the risk of leaks, incorrect injector positioning, and control unit adaptation errors.

Benefits of Using an Original Fuel Rail

Compared to aftermarket alternatives of unknown origin, the original BMW fuel rail offers a number of practical advantages:

• factory fit for the engine – no issues with mounting and injector positioning,
• maintenance of stock operating parameters – correct pressure and fuel distribution in the rail,
• stable engine operation – reduced risk of misfires and jerking,
• easier diagnostics – component compliant with BMW service documentation.

For users who want to keep their E39 or E46 in good technical condition, using an original rail is a sensible compromise between cost and durability.

Related Injector System Components and Service Knowledge

When replacing the rail, it is worth checking the condition of the injectors, fuel lines, and seals. If you want to better understand how injection problems manifest, the article: Diesel Injector Faults – How to Recognize Them and What Their Neglect Entails will be helpful. It will allow you to correlate symptoms with possible causes within the fuel supply system.

If you are looking for other BMW injector nozzles for your car, check out our dedicated category: BMW injector nozzles, where you will find a wide selection of injector system components tailored to various models of this brand.