BMW E60 E65 E90 E91 M57N2 Fuel Feed Pipe Hose Overflow Oil Line 7799869

BMW E60 E65 E90 E91 M57N2 Fuel Feed Pipe Hose Overflow Oil Line are original fuel system components from the Lines, hoses and pipes group, designed for BMW diesel engines. They ensure a stable fuel return in the diesel injection system, which translates into smooth engine operation and proper compatibility with factory electronics.

Specifications and technical data

• SKU: 7799869-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7799869
• Substitutable numbers: 13537799869, 7799869, 13537799962, 7799962, 13537792870, 7792870, 7801660
• Fuel type: Diesel
• Category: Hoses, Lines & Pipes

Purpose and function in the fuel system

Overflow lines in a Diesel engine are responsible for draining excess fuel from the injectors back into the system, stabilizing operating pressure. In BMW E60, E65, E90, and E91 series models, this is a key component for the proper operation of the precise common rail injection system, affecting engine refinement, ease of starting, and reducing the risk of air locks.

Compatibility and fitment for BMW

The offered set of overflow lines has been designed specifically for selected BMW premium and mid-range models, which guarantees proper routing of fuel lines and compatibility with factory mounts. As a result, installation is orderly, without the need for modifications or makeshift workarounds, and the system retains the original geometry of the lines.

Product characteristics and advantages

As an item from the Lines, hoses and pipes category, the overflow lines are responsible for the safe transport of fuel in the engine bay. Using an original BMW solution allows you to maintain:

• proper fuel flow in the overflow circuit,
• adequate sealing of connections at the injectors,
• consistency with the factory mounting and bracket system,
• stable operating conditions in the high temperatures of the engine compartment.

This solution is particularly recommended for symptoms of rough idling, starting problems on a warm engine, or visible leaks around the injectors.

Condition, origin, and service application

The item comes from the BMW range and is intended for reinstallation in vehicles with a diesel engine where maintaining the original fuel system specification is required. It is suitable for both standard maintenance replacements and major service work related to injector regeneration or engine accessory upgrades.

Support in selection and system expansion

If you are planning a comprehensive repair or upgrade of the engine area in your BMW and need other components from the same group, such as flexible fuel lines, return hoses, or feed pipes, check out the available parts in the BMW lines, hoses and pipes category.

For drivers interested in informed choices of components for premium cars and the broader context of the parts market, it is worth reading the analysis of trends in the segment of original used parts: Crisis in the new parts market? Why in 2026 used originals for premium cars (BMW, Mercedes, Porsche) are the hottest trend.