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5 volt fuel level gauge
The voltage of all automobile appliances is 12 volts and the signal voltage is 5 volts.
The car fuel gauge is used to indicate the amount of fuel in the car's fuel tank. It can be a pointer or a digital display. The fuel gauge consists of a fuel level indicator with a regulator and a fuel level sensor. The function of the low fuel level alarm device is to light up the alarm immediately when the fuel quantity in the fuel tank is less than a certain value, so as to attract the driver's attention.
The precautions for using the fuel gauge are as follows:
1. Do not wait until the alarm light is on before refueling, because the gasoline pump is in the fuel tank and relies on gasoline to dissipate heat and lubricate it. Too little oil will not be conducive to the normal operation of the oil pump and reduce its service life;
2. It is not recommended to fill up when refueling, because gasoline expands due to heat and volatilizes into gasoline vapor at high temperature in summer, which requires space to accommodate. If it is overfilled and there is no space, gasoline vapor or even liquid gasoline will enter the carbon canister for storage, and the carbon canister will escape into the air when it is full, which will not only waste but also pollute the environment;
3. Indication deviation, daily replacement of battery or gasoline filter element, or even after parking overnight, when starting the vehicle again, it may be noticed that the pointer of the fuel gauge is lower than the previous display position, which is considered a fault. In fact, it is a normal phenomenon, because when the fuel pump is working, the fuel tank is under negative pressure, the corresponding fuel tank volume is reduced, and the oil level is high. The pressure is released and the oil level drops, so it is a normal phenomenon to have a display deviation. But the deviation is generally not more than one pointer width.
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