Is the BMW X3 Fuel Filter Internal or External?
1 Answers
New BMW X3 models feature an external fuel filter, located slightly to the rear right of the transmission underneath the vehicle. Older models have an internal fuel filter positioned on the left side of the rear seats. Below is expanded information about fuel filters: 1. External fuel filters should be replaced every 10,000 kilometers, while internal fuel filters vary by brand - BMW recommends replacement every 30,000 kilometers. 2. The fuel filter, also known as a petrol filter, comes in carburetor and fuel injection types. In carbureted gasoline engines, the fuel filter is located on the inlet side of the fuel pump with lower working pressure, typically featuring a nylon housing. Fuel-injected engines have the filter on the outlet side of the fuel pump with higher working pressure, usually employing a metal housing. 3. The fuel filter's function is to remove water and impurities from gasoline. During engine operation, fuel flows through the inlet pipe into the filter's sediment bowl under the fuel pump's pressure. As the volume increases and flow rate decreases, water (which is heavier than oil) and impurity particles settle at the bowl's bottom. Lighter impurities flow with the fuel toward the filter element, while clean fuel permeates through the element's micropores into its interior before exiting through the outlet pipe.
