Is the BMW fuel filter internal or external?

[LaIker]

BMW fuel filters are external. Function of fuel filter: It removes solid impurities such as iron oxide and dust contained in the fuel, prevents fuel system blockages (especially the injectors), reduces mechanical wear, ensures stable engine operation, and improves reliability. Replacement cycle of fuel filter: External fuel filters are installed under the chassis. During driving, sand and mud water can splash onto their surface, causing corrosion and damage to the filter interfaces and housing, and sometimes even impacts. Therefore, external fuel filters have a relatively short service life and typically need replacement every 20,000 km. In contrast, internal fuel filters combined with the fuel pump are enclosed within the fuel tank and are hardly affected by external factors, thus having a longer lifespan of up to 80,000 km.