Drain the
Fuel Tank and disconnect the negative cable from the battery, ensuring to read the battery disconnection cautions beforehand. Remove the rear seat to access the Fuel Level Sensor, pinch the sides of the electrical connector to detach it, then cut the hose clamp and disconnect the hose. Utilize BMW special tool 16 1 020 to remove the locking ring on the fuel tank cover, then carefully withdraw the Fuel Level Sensor while pressing the locking tabs and gently prying the suction jet pump connection down and off, turning the unit in different directions to avoid damage. Take care not to bend the sensor arm and tilt the front of the cover gently upwards for removal. When reinstalling, replace the O-ring on the Fuel Level Sensor and apply a light coat of engine oil to it. The installation follows the reverse order of removal, ensuring to use a new sealing gasket, guide the Fuel Level Sensor into the tank opening, align the sender lug with the notch in the fuel tank, listen for the locking ring to engage, tighten it to the specified torque, ensure fuel line connections are oriented the same as before, reconnect the harness connector and fuel hose with a new hose clamp, add fuel, check for leaks by running the engine, and finally install the access cover. Before starting the engine, confirm there is at least 5 liters (1.5 gallons) of fuel in the tank to prevent damage to the fuel pump.