BMW E81 E87 LCI 118d Diesel N47 Injector Fuel Rail Sensors 7801656 0445214134

The BMW E81 E87 LCI 118d Diesel N47 fuel rail is a precise component of the diesel engine's fuel supply system, designed specifically for the N47 unit in the 118d model. It is responsible for stable fuel supply to the diesel injectors, which translates to smooth engine operation and predictable performance.

Specifications and technical data

• SKU: 7801656
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7801656
• Substitutable numbers: 13537801656 0445214134 13537805734 13537801987, 7801656, 0 445 214 134, 7805734 7801987, 13537795862 13537804401, 7795862 7804401
• Fuel type: Diesel
• Category: Fuel Injectors

Purpose and Function in the Common Rail System

The fuel rail in the N47 engine plays a key role in the Common Rail system, accumulating fuel under high pressure and distributing it to individual injectors. A correctly selected fuel rail ensures:

• stable fuel pressure across the entire engine speed range,
• precise diesel fuel metering into the cylinders,
• smooth engine operation and reduced vibrations,
• better throttle response and repeatable operating parameters under load.

Thanks to the proper functioning of the fuel rail, the diesel fuel supply system maintains adequate pressure reserve, which is particularly important during dynamic driving and frequent load changes.

Compatibility and Interchangeable Numbers

The offered fuel rail has been developed as a dedicated component for the BMW 118d with the N47 engine in E81 and E87 LCI (facelift) body styles. The product has an assigned OEM part number and a set of interchangeable numbers, which facilitates the selection of the correct component during fuel system replacement or repair.

The presence of multiple reference numbers allows this fuel rail to be used as a replacement in various factory configurations, provided it is consistent with the vehicle's service documentation. Before purchasing, it is advisable to compare the designations with the vehicle's data or consult a mechanic to confirm full compatibility.

Technical Characteristics and Fuel Type

The fuel rail is designed to operate in a Diesel fuel supply system, which requires maintaining very high fuel pressure while ensuring tightness and resistance to thermal loads. The component's construction is adapted to the specifics of the N47 engine, including:

• resistance to pressure pulsations generated by the high-pressure pump,
• stabilization of fuel flow to individual injectors,
• operation within a wide temperature range typical for diesel units.

The correct selection of the fuel rail for a diesel system directly impacts exhaust emissions, fuel consumption, and the durability of injectors and the high-pressure pump.

Condition, Service Application, and Benefits of Installation

The offered fuel rail is a component from the injector nozzles category, intended for service applications in BMW vehicles with the N47 engine. It can be used for both fuel system repairs and comprehensive engine accessory regeneration when multiple components need to be replaced simultaneously.

Replacing the fuel rail with a functional component can, in many cases, reduce typical symptoms of fuel supply problems, such as:

• rough idling,
• power loss during acceleration,
• starting difficulties with a warm or cold engine,
• increased smoke under load.

A properly functioning fuel rail also supports longer service life of injectors and the high-pressure pump by stabilizing the operating conditions of the entire system.

Technical Support and Additional Materials

When diagnosing and repairing the diesel fuel supply system, it is worth paying special attention to the condition of the injectors and components cooperating with the fuel rail. If you want to better understand the symptoms of damage and the consequences of neglect, the article: Diesel Injector Failures – How to Recognize Them and What Their Neglect Entails, will be helpful, as it discusses typical symptoms, effects, and diagnostic methods.

If you are looking for other BMW injector nozzles for your car, check out our dedicated offer: BMW injector nozzles. This will help you easily select components that fit your specific model and engine version.