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2000 chevy express fuel gauge shows fuel level past full mark
It may be that the filling is too full, resulting in errors. If this happens after running for a period of time, it is the problem of the fuel float.The fuel float floats on the fuel surface by buoyancy. The position of the float is the liquid level position. Knowing the liquid level height, the volume of fuel in the fuel storage tank can be known by the shape of the fuel tank. In other words, it is a sliding rheostat. The fuel level is different and the float is different. The resistance value of the sliding rheostat linked with the float is different. The computer gives a voltage to the sliding rheostat. After returning the voltage drop, the computer estimates the fuel quantity and displays the data to the automobile instrument. The float in the actual fuel tank is a sliding variable resistance, which changes the resistance in the circuit by floating on the float, and then is reflected by the fuel gauge pointer on the instrument.
How to do:After removing the fuel float, you open the key teeth, use the manual fuel float (moving up and down), and check whether the pointer of the meter moves while moving. If it is moving, it is a line card, then install it. If it does not move, it may be that the fuel float or the fuel meter is broken. In many cases, the fuel float is broken, and it is enough to replace it.Factors such as vehicle stability and negative pressure inside the fuel tank may cause differences in the fuel gauge. At the same time, the fuel gauge is designed to linearly represent the actual fuel volume of the fuel tank.
The fuel tank float or the circuit is broken or the meter itself has a problem. If the circuit is scratched and broken, it will be charged. If it is the problem of the meter or the float, the warranty of some vehicles is three months and six months, and some are one year. Or two years, you can go to the 4S store to see, or you can call to ask, it should be within the warranty period.Because the fuel float sensor in the fuel tank needs space allowance, the fuel is too full, and the fuel float is pushed to the top of the fuel tank by the buoyancy of the fuel, and the pointer connected to the sensor will not move. When a little fuel is consumed, the fuel float will drop, and the pointer will follow. move the sensor. The fuel level sensor's determination of the fuel level is not completely accurate. The reason why the fuel gauge pointer can float up and down to remind you of the fuel level is all thanks to the above gadget. It is called the fuel level sensor. Its working principle is that through the process The floating of the buoy (the black tool on the metal feeling) changes the resistance of the variable resistor (silver disc) below, thereby changing the magnitude of the current passing through, and finally the change of the pointer of the fuel meter through the rotation of the current.
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