BMW 7 Series fuel filter is located inside the fuel tank. Open the fuel tank cap to see the fuel pump assembly, and disassemble the fuel pump to access the fuel filter. Depending on the material, it can be divided into iron and plastic types. The built-in fuel filter is currently the most environmentally friendly, scientific, safe, and fuel-efficient type. The built-in fuel filter is installed inside the fuel tank and assembled with the fuel pump to form the fuel pump assembly, making replacement relatively more complicated. Below is additional information about the fuel filter: 1. The fuel filter, professionally known as the fuel filter, is connected in series in the pipeline between the fuel pump and the throttle body inlet. The purpose of the fuel filter is to filter out solid impurities (such as iron oxide and dust) contained in the fuel, thereby protecting the fuel pump nozzle, cylinder liner, and piston rings. It not only significantly reduces wear but also prevents clogging. 2. To ensure the effective protective function of the filter, it is generally recommended to replace the fuel filter every 10,000-20,000 kilometers. However, the actual situation should be considered. If the filter element inside the fuel filter has noticeably turned black, it should be replaced promptly. Note that when replacing the fuel filter, the engine oil, oil filter, and air filter should also be replaced. After installation, be sure to check the sealing of the interface to avoid oil leakage.
