Where is the fuel pump control module located on the BMW 520?
2 Answers
BMW fuel pump control module is located above the fuel tank, next to the fuel pump. Function of the fuel pump: To draw gasoline from the fuel tank and deliver it through pipelines and the fuel filter to the float chamber of the carburetor. It is because of the fuel pump that the fuel tank can be placed at the rear of the vehicle, away from the engine and below it. Classification of fuel pumps: Fuel pumps can be divided into two types based on their driving methods: mechanically driven diaphragm type and electrically driven type. The diaphragm fuel pump is representative of mechanical fuel pumps and is used in carburetor engines, typically driven by an eccentric wheel on the camshaft. Electric fuel pumps are not driven by the camshaft but rely on electromagnetic force to repeatedly move the pump diaphragm.
When I want to locate the BMW 520 fuel pump control module, I remember it's usually under the right rear seat of the car. You need to gently lift the rear seat cushion to see a black box, which is where the control module is located; because it's close to the fuel tank, the signal transmission is fast and there are fewer failures. If the module is faulty, the car may not start or experience power interruptions while driving. First, check if the fuses and wiring are loose. I've tried locating it once myself—the position is quite reasonably designed, but before touching it, you must turn off the car's power and carefully remove the seat with a screwdriver. Don't act blindly to avoid short-circuiting. BMW's design hasn't changed much over the years—the location is the same for both old and new cars. It's best to wear gloves when working on it yourself, as too much dust can affect the module's heat dissipation. If you can't find it, take a photo and check the manual or seek professional guidance. Knowing the exact position makes repairs more reassuring.
