BMW F20 F21 F30 LCI 116i 118i 318i B38 Fuel Tank Breather Line Pipe Hose 7645854

BMW F20 F21 F30 LCI 116i 118i 318i B38 Fuel Tank Breather Line Pipe Hose is an original component from the Lines, hoses and pipes group, designed for the fuel system of selected BMW 1 and 3 series models after the facelift. It ensures proper tank ventilation, stable operation of the fuel supply system, and reduces the risk of leaks and errors related to fuel vapor pressure.

Specifications and technical data

• SKU: 7645854-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7645854
• Substitutable numbers: 13907645854, 7645854
• Category: Hoses, Lines & Pipes

Purpose and technical function

The offered breather line is dedicated to the fuel system in petrol versions of the BMW F20 and F30 LCI, such as the 116i, 118i, and 318i. Its task is to control the discharge of fuel vapors from the tank, which supports stable system pressure, improves engine performance, and helps maintain compliance with exhaust emission standards.

Thanks to its factory geometry and correct internal diameter, the line works with standard connectors and mounts, minimizing the risk of kinks, blockages, or leaks. This is particularly important in modern units where the fuel system is strictly monitored by the engine electronics.

Original BMW craftsmanship

The line comes from the BMW OE line, which means it maintains factory standards for material quality, flexibility, and resistance to petrol and its additives. The original design ensures:

• a secure fit to standard body mounts and routings,
• appropriate rigidity while maintaining the required flexibility,
• compatibility with the factory fuel tank ventilation system.

Choosing an original line from this group reduces the risk of problems typical of aftermarket replacements, such as incorrect length, different diameters, or poorer resistance to operating conditions.

Condition and benefits of using a used OEM component

The item is offered in used condition, which in practice means it is of factory origin while retaining the functionality required for further operation. For many BMW users, this is a reasonable compromise between cost and quality – the line retains its original specification while allowing for reduced expenses when repairing the fuel system.

If you are considering whether it is better to choose a used OEM component or a cheaper replacement, the following article may be helpful: 5 reasons why a used OEM part is a better choice than a replacement. You will find practical tips and selection criteria useful when planning a repair.

Practical application in service and diagnostics

Replacing the fuel tank breather line is recommended, among other things, when there is a smell of fuel near the rear of the car, errors related to the EVAP system, refueling problems, or visible signs of cracks and rubber degradation. Using an original line from this group allows for the restoration of the correct vapor flow path, which facilitates diagnostics and eliminates false sensor readings.

Due to the factory fit, installation is predictable – the line follows the original route without the need for modifications or the use of additional connectors. This shortens service time and reduces the risk of subsequent leaks.

Expanding the scope of repairs – 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 additional lines, flexible hoses, or rigid guide pipes, check the available parts in the BMW lines, hoses and pipes category.

Summary

BMW F20 F21 F30 LCI 116i 118i 318i B38 Fuel Tank Breather Line Pipe Hose is a technically matched, original fuel system component that helps maintain proper tank ventilation and stable engine operation. Choosing a used OEM line from this group is a practical solution for drivers and service centers that expect factory compatibility, predictable installation, and the maintenance of operating parameters in accordance with BMW manufacturer specifications.