BMW 7 Series E65 E66 M57N2 Fuel Feed Injectors Pipe Hose Overflow Line 7799974

BMW 7 Series E65 E66 M57N2 Fuel Feed Injectors Pipe Hose Overflow Line is an original diesel engine fuel system component, designed for precise fuel delivery to the injector. Thanks to its factory geometry and perfect fit for the specific M57N2 engine unit, it ensures stable fuel injection system performance and correct injection pressure. This is the ideal solution for users who expect compliance with BMW factory specifications and wish to maintain the integrity of the entire fuel system.

Specifications and technical data

• SKU: 7801646
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7801646
• Substitutable numbers: 13537801646, 7801646, 13537799974, 7799974, 13537792867, 7792867
• Category: Hoses, Lines & Pipes

Purpose and function in the fuel system

The fuel injector pipe in the M57N2 engine is responsible for the controlled transport of fuel under high pressure from the rail to the specific injector. The correct internal diameter, shape, and connection ends are crucial for maintaining a tight seal and proper fuel atomization in the combustion chamber. In BMW E65 and E66 units, a correctly selected pipe has a direct impact on engine smoothness, dynamics, and exhaust emissions.

As an element from the Lines, hoses, and pipes group, this part operates under demanding pressure and temperature conditions, which is why using an original BMW solution helps reduce the risk of leaks, pressure drops, or starting issues on both warm and cold engines.

Benefits of using an original BMW pipe

Using a fuel pipe dedicated to the M57N2 in a BMW E65/E66 offers a number of practical benefits:

• maintenance of factory fuel injection system performance parameters,
• proper fit to injector seats and the fuel rail,
• reduction of the risk of micro-leaks and fuel seepage,
• stable engine operation under load and at idle,
• easier fuel system diagnostics due to compliance with the factory design.

The original BMW fuel injector pipe also ensures hassle-free installation – the shape, length, and ends are adapted to the specific engine and body variant, eliminating the need for modifications or fitting aftermarket replacements.

Characteristics and installation

The fuel injector pipe in this model is designed as a high-pressure component, working with a precision common rail pump and injectors. The pipe construction is optimized for:

• resistance to the operating pressure of the common rail system,
• dimensional stability under varying operating temperatures,
• the rigidity necessary to maintain proper routing in the engine bay.

The product is offered as a used original BMW part, which in practice means maintaining factory geometry and compatibility while optimizing repair costs compared to new parts. Before installation, a standard inspection of the sealing seats and proper tightening according to the manufacturer's service procedure is recommended.

Part selection and compatibility

When selecting a fuel injector pipe for a BMW E65/E66 with the M57N2 unit, it is worth paying attention to compatibility with the specific engine configuration and vehicle year. The original BMW part from this group has an assigned OEM number and associated interchangeable numbers, which facilitates compatibility verification in service catalogs and parts selection systems. This allows for precise matching of the pipe to the specific cylinder and engine accessory variant.

If you are planning a comprehensive repair or upgrade of the fuel system area in your BMW and need other elements from the same group, such as feed lines, return lines, or high-pressure pipes, check the available parts in the BMW Lines, hoses, and pipes category.

Why choose a used original part

For fuel system components, many users consider whether refurbishment or purchasing a used OEM component is the better solution. High-pressure fuel pipes are designed as precision elements, and their refurbishment is often technologically and economically limited. A used original BMW pipe allows you to maintain the factory material and design specifications, which is particularly important in diesel engines with high injection pressure.

If you want to analyze the differences between refurbishment and purchasing used components in more detail, it is worth reading our guide: Refurbished or used original – which part to choose for repairs?. This will help you better assess when choosing a used BMW fuel injector pipe is the most cost-effective and technically justified option.