English 
the fuel level sensor in the fuel tank may fail causing erratic fuel gauge operation
The pointer position of the fuel gauge is unstable, it may be that there is a problem with the fuel level sensor of the fuel gauge. What is the reason for the inaccurate display of the fuel gauge] The fuel level sensor is fixed on the fuel pump bracket. If the fuel gauge is inaccurate due to the deformation of the fuel tank and abnormal support, such faults can only be checked by removing the fuel pump. The fuel level sensor sends an fuel level signal to the instrumentation through the engine module. If there is a virtual connection, open circuit or short circuit in the engine module, the fuel level sensor signal cannot be transmitted to the instrument, causing the instrument to not display the fuel level. In this case, you can use diagnostic instruments to help you judge.
The wiring harness on the car shares an iron point. Sometimes, another iron wire is added to make the data more accurate for electrical equipment. If the fuel level sensor and fuel pump wiring harness on your car is loose, it can also cause inaccurate fuel levels. In this case, all iron wires can be used to eliminate faults.
The pointer position of the fuel gauge is unstable, which may be a problem with the fuel level sensor of the fuel gauge. If it is confirmed that the fuel is full and the fuel gauge pointer does not reach the top, there should be a problem with the fuel gauge display. Check the fuel level sensor ECU for the line, if the line is open or falsely connected, the fuel gauge will not display or display inaccurately. In this case, it is necessary to repair the wiring. Check the sliding resistance of the fuel level sensor for poor contact or severe wear, and output wrong signals, resulting in inaccurate fuel gauges. Replacing the fuel level sensor can solve the problem. Abnormal instrument circuit or virtual connection aging of electrical components will also cause abnormal fuel gauge indication. After the instrument fails, the instrument can only be replaced to solve the problem.The failure of the fuel level sensor will occur: the engine fuel temperature signal or the signal of the fuel level sensor is abnormal, and the fuel level value of the engine fuel is lower than the minimum value. Fault diagnosis and troubleshooting: Start the engine, the idling and acceleration conditions are basically normal, but the engine failure warning light on the dashboard remains on. Connect the GTl tester for self-diagnosis, select the 5 series E60/E61 chassis model, double-click the "DME digital engine electronic servo control system" item in the main menu of the electronic control system diagnosis, and the GTl tester will scan the item separately. Click the "Control Module Function" button, select the DME electronic control system, query the fault information, and solve it.
Get a Quote / Info