BMW 740i gas gauge malfunction after fuel pump and filter repair on BMW 740i

Some BMW 740i owners report experiencing gas gauge malfunctions following fuel pump and filter repairs, which may be due to loose wires in the fuel gauge sender unit inside the fuel tank. This issue can result in erratic behavior of the fuel gauge, including sudden position changes and inaccurate readings. Additionally, if the fuel pump fails after the repair, owners may encounter rough engine running, stalling, difficult starting, loss of power, or complete engine shutdown. Proper diagnosis is crucial, and one method involves listening for a momentary whirring noise from the fuel tank when the ignition is turned on, indicating that the pump is pressurizing the fuel lines. Addressing these concerns may require wire resoldering or replacement to ensure the gas gauge functions correctly.