Working Procedure of a Fuel Level Switch

The fuel tank of every vehicle comes with a level switch; many also refer to this vehicle part as the level sensor. This special sensor consists of three main components, a resistor, a float and an actuating shaft. These three components work together to send variable signals to the vehicle's fuel gauge. The most common term used for this sensor assembly is "sender". Individuals who want to gather knowledge about the working procedure of fuel level switches should first know how each of these three components functions.

Let us begin by explaining the features of the float. The exterior of a float has significant similarities with that of ballcocks found in lavatory cisterns. Buoyant floats are either metal ellipsoids or foam solids or sealed composites. Instead of having a circular body, they possess an oval structure; which allows them to rest on the fuel surface more easily.

The next component we will discuss about in this article is the actuating shaft or actuating rod of the level sensor. This rod is a pivoted structure that remains attached to the float. Changes in the level of diesel or gasoline in the fuel tank result in changes in position of the float (it keeps on moving up and down). As the float moves, the attached end of the actuating shaft also moves.

The final component of a level switch is the resistor. The battery of the vehicle supplies 12V power to the resistor, which remains connected to the vehicle's fuel gauge by means of a wire. You will come across two kinds of vehicles. In the first kind, the wire runs to the gauge directly and in the second kind, the wire runs into a stepper before running to the gauge. The stepper is used for interpreting the signal and then actuating a digital readout or mechanical gauge.

It's true that a level switch is a device that a car owner can rely on for staying informed about the level of liquid present in his vehicle's fuel tank. However, under certain circumstances, this special sensor might fail to deliver accurate results. You might find the float reaching its fullest extent much before the tank gets entirely empty or entirely full. This problem will not hamper the functionality of your car, but we will still advise you to get it fixed as quickly as possible. Ideally, you should get the faulty level sensor replaced by a brand new piece.

The author of article runs a store that sells products used for measuring different process parameters, for instance, level switch, humidity calibrator, tools for dust measurement etc. The collection of level sensors of this store includes Microwave, Float, Ultrasonic and RF Capacitance Level Switch.

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