BMW 1 3 Series E81 E87 LCI E90 120d 320d 520d N47 Injector Pipe Pressure Hose

The BMW E81 E87 LCI E90 120d 320d 520d N47 Injector Pressure Line is an original fuel supply system component designed for BMW diesel engines from the N47 family. This precisely manufactured line ensures stable fuel delivery to the injector, which translates to smooth engine operation and correct injection characteristics.

Specifications and technical data

• SKU: 7800609
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7800609
• Substitutable numbers: 13537800609, 7800609
• Category: Fuel Injectors

Purpose and Function of the Pressure Line

The offered pressure line operates in the high-pressure area of the common rail system, connecting the fuel rail to the injector in the N47 engine, used in BMW 1, 3, and 5 Series models, among others. Its function is to stably maintain fuel pressure and limit flow losses, which directly impacts the smoothness of operation, dynamics, and exhaust emissions.

A properly selected pressure line minimizes the risk of leaks, micro-cracks, and uncontrolled pressure drops, which can lead to starting problems, power loss, or uneven engine running.

Benefits of Using an Original BMW Line

Choosing a pressure line from the Injector Nozzles category, dedicated to N47 units, offers a range of practical benefits for everyday use:

• Factory Geometric Fit – correct positioning relative to the rail and injector, without stress or modifications.
• Appropriate Flow Characteristics – maintaining the injection system's operating parameters according to the manufacturer's specifications.
• Reduced Risk of Leaks – proper sealing at connections and stable operation under high pressure.
• Seamless Integration with the Common Rail System – no need for adaptation or modification of the fuel system.

Component Condition and Service Application

This line comes from the BMW offering and is intended for service applications in N47 engines where maintaining the original injection system specification is required. It is suitable for both replacing a single injector and for comprehensive fuel system servicing when restoring sealing and correct pressure parameters is necessary.

In workshop practice, using an original line allows for maintaining predictable engine behavior after repair, which facilitates diagnostics, tuning, and subsequent vehicle operation.

Injector System Diagnostics and Part Selection

When experiencing problems with diesel engine operation – such as difficult starting, smoking, power loss, or metallic knocking – it is advisable to check not only the injectors themselves but also the condition of the high-pressure lines. Leaks or deformations in the line can cause disruptions in fuel delivery, which are often mistaken for injector failure.

To better understand the symptoms and consequences of injector damage, the following article will be helpful: Diesel Injector Faults – How to Recognize Them and What Neglecting Them Entails. It helps to organize knowledge about diagnostics and facilitates making decisions about the scope of repair.

Other BMW Injector Nozzles and Used OEM Parts

If you plan to replace other components in this group during fuel system repair, check the available BMW injector nozzles in our assortment. The full offer can be found here: BMW injector nozzles, which will help you select compatible components for a specific engine and model.

For repairs carried out "on time," it is worth considering used OEM parts, which are often available immediately and can reduce vehicle downtime in the workshop. More on this topic can be found in the material: How Used OEM Parts Affect Repair Time and Vehicle Stay in the Workshop.