Where is the fuel filter located on a BMW 523?

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The BMW 523 has two types of fuel filters: internal and external. The external one can be found on the vehicle's chassis, typically as a cylindrical component along the fuel line, near the fuel inlet pipe. The internal type is located inside the fuel tank, assembled together with the fuel pump. More details are as follows: 1. The fuel filter, also known as the gasoline filter, is primarily used to remove impurities from the fuel. 2. If the fuel filter becomes excessively dirty or clogged, common symptoms include sluggish acceleration, difficulty starting the engine, or requiring multiple ignition attempts (2-5 times) to start the vehicle. 3. Most modern engines are equipped with disposable, non-cleanable paper fuel filters, which generally require replacement every 10,000 kilometers. If the fuel used has fewer impurities, replacement can be extended to 15,000-20,000 kilometers. The filter has inlet and outlet arrows marked on it; ensure correct orientation during replacement to avoid installation errors.