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

Fuel Tank Breather Line BMW F20 F21 F30 LCI 116i 118i 318i B38 Pipe Hose is an original fuel system component, designed specifically for BMW F-series models after the facelift. This precisely molded breather line ensures stable fuel tank operation, proper vapor discharge, and safe pressure equalization within the system. Thanks to its factory geometry and connectors, this is a part ready for installation in place of a worn component, with no modifications required.

Specifications and technical data

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

Purpose and function in the fuel system

The breather line in BMW F20, F21, and F30 LCI models is responsible for the controlled discharge of fuel vapors from the tank and maintaining proper pressure in the system. A properly functioning component:

• stabilizes fuel tank operation during temperature and fuel level changes,
• limits the risk of vacuum or overpressure buildup in the tank,
• supports the correct operation of the fuel vapor emission control system,
• reduces the risk of unwanted fuel odors around the vehicle.

Thanks to its fitment for the specific generation of the BMW F-series, the line maintains the correct routing and bending radii, which minimizes mechanical stress and the risk of leaks.

Construction and fitment for BMW

The offered line belongs to the Lines, hoses, and pipes group, meaning it was designed as an integral part of the BMW fuel system. The construction includes:

• a factory-shaped tube with the appropriate working diameter,
• dedicated ends for quick-connectors or mounting clamps (depending on the system version),
• a carefully selected material resistant to contact with fuel vapors and temperature changes.

Such execution allows for trouble-free installation in original mounting points, without the need to adapt universal replacements or modify the installation.

Characteristics of the used part

The item comes from dismantling and is offered as a used part, which represents a reasonable compromise between cost and functionality. In the case of breather lines, it is crucial to maintain:

• material continuity along the entire length,
• absence of cracks, abrasions, and visible deformations,
• tightness in the connection zones.

A used line, after verifying its condition, can still ensure proper fuel system operation, especially in vehicles used daily, where functionality and compliance with the original design are key.

Benefits of using an original BMW line

Using an original breather line in the BMW F20, F21, and F30 LCI brings a number of practical benefits:

• Factory fitment – maintaining the original routing of the line, which facilitates installation and eliminates the risk of rubbing against other components.
• Compatibility with the BMW fuel system – the line works with factory connectors, brackets, and covers.
• Stable operating parameters – proper tank venting promotes uniform operation of the fuel supply system.
• Reduction of diagnostic problems related to leaks and fuel vapor emission system errors.

If you are planning comprehensive fuel system maintenance or replacing several installation components, it is worth considering other components from the lines and pipes group to maintain the consistency of the entire system.

Support with selection and additional information

Before purchasing, it is recommended to compare the shape and mounting method of the line with the component currently installed in the car to confirm full compatibility with the specific equipment version. If needed, you can use additional guide materials – the article on myths and facts about used car parts will be helpful, which explains what to look for when choosing parts from dismantling.