BMW 1 3 Series F20 F21 F30 LCI M140i 340i B58 Fuel Tank Breather Line Pipe Hose

BMW 1 3 Series F20 F21 F30 LCI M140i 340i B58 Fuel Tank Breather Line Pipe Hose is an original fuel system component from the Lines, Hoses and Pipes group, designed for BMW models with the modern B58 engine. It ensures proper fuel tank ventilation, stable system operation, and the reduction of unwanted vapors, which translates into trouble-free vehicle operation.

Specifications and technical data

• SKU: 7643104-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7643104
• Substitutable numbers: 13907643104, 7643104, EM
• Category: Hoses, Lines & Pipes

Purpose and technical function

The offered fuel tank breather line is dedicated to the BMW 1 Series F20/F21 and BMW 3 Series F30 LCI in M140i and 340i versions with the B58 engine. Its task is to provide controlled discharge of fuel vapors from the tank so that the system pressure remains within a safe range and the engine runs stably across the entire load range. Thanks to its precise fit to the factory fuel system, the line works in harmony with other installation components, minimizing the risk of leaks, performance drops, or diagnostic errors related to the EVAP system.

Construction and fitment for BMW F20/F21/F30 LCI

The line was designed by BMW as an OEM component, which means it maintains factory geometry, connection diameters, and mounting points. This facilitates installation in the chassis and fuel tank area without the need for modifications or the use of additional adapters. Key design features:

• factory-shaped routing for the F20/F21/F30 LCI chassis architecture,
• designed cutouts and bends to limit kinks and vapor flow restriction,
• connectors adapted to standard BMW quick-connect fittings and mounting brackets. Such a solution allows for maintaining the integrity of the entire fuel system and facilitates future servicing.

Benefits of using an original line

Using an original fuel tank breather line in M140i and 340i B58 models has a direct impact on the reliability and refinement of the powertrain. Proper fuel tank ventilation reduces the risk of:

• errors related to the fuel vapor emission system,
• incorrect pressure in the tank, which can affect fuel pump operation,
• leaks and vapor escapes in the chassis area. Choosing an item from the Lines, Hoses and Pipes group in the OEM version also ensures that the materials used are resistant to long-term contact with fuel and temperature changes typical for operating a vehicle with a powerful gasoline engine.

Condition, verification, and service application

The item comes from disassembly and is offered as used, which provides a cost-effective solution while maintaining original BMW specifications. This type of line is particularly useful for:

• repairing leaks in the fuel tank ventilation system,
• post-collision repairs in the rear section of the vehicle,
• comprehensive fuel system maintenance in models with the B58 engine. To ensure correct selection, it is worth comparing the shape and routing of the line with the component installed in the vehicle and verifying compatibility with BMW service documentation.

System expansion – related components

If you are planning a comprehensive repair or upgrade of the fuel system area in your BMW and need other components from the same group, such as return lines, supply hoses, or breather pipes, check the available parts in the BMW Lines, Hoses and Pipes category. For those interested in a broader look at the development of technical solutions in the automotive industry and the impact of fuel system design and accessories on vehicle operation, the article describing changes in the premium car segment may be helpful – Evolution of the Mercedes S-Class: from W140 to W222 – innovations, model differences and Mercedes auto parts over the years.