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stack fuel level gauge sending unit
The function of the stack fuel level gauge sending unit is to provide maximum fuel flow to the oil pump. The ECU changes the area of the high-pressure oil pump's oil inlet section through signals to change the size of the oil inlet volume.
The fuel measurement unit is one of the important components of a vehicle's fuel supply system. The volume of the fuel measurement unit is relatively small and precise. If low-quality fuel is used in normal times, the fuel measurement unit and fuel pump are prone to malfunctions. The main symptom of a malfunctioning fuel metering unit is that the engine fault light on the vehicle's instrument panel comes on, and the vehicle is unable to ignite. When the fuel metering unit is damaged, the vehicle will automatically stop the operation of the fuel injector, which can avoid damage caused by excessive internal pressure in the fuel injector. The fuel metering unit is generally installed at the high-pressure oil pump, which mainly controls the fuel injection volume and fuel pressure value. If we use inferior fuel filter elements in our daily lives, the small particles in gasoline are likely to block the fuel metering unit, causing it to fail. Is there a certain relationship between the metering unit and fuel consumption. If the fuel metering unit malfunctions, there is a high possibility of an increase in fuel consumption or a decrease in power. Firstly, if the fuel injection volume of the fuel metering unit is higher than the calibrated one, the amount of fuel entering the cylinder will increase each time, leading to an increase in fuel consumption. If there is a blockage in the fuel metering unit, then every time λ The amount of fuel in the cylinder will decrease, resulting in a serious decrease in vehicle power and, in severe cases, the possibility of not being able to ignite. Therefore, when discovering abnormal fuel consumption in vehicles, it is advisable to check the fuel measurement unit.
According to different internal structures, the metering units are further divided into normally open type, maximum opening in the free state without power supply and normally closed type, fully closed without power supply. Commercial vehicles are usually equipped with a normally open metering unit. When there is no current flowing, the valve core is normally open under the action of the spring and is at the position of the maximum fuel supply. When the control current passes through the electromagnetic coil of the metering unit, a magnetic force is generated and the valve core is pushed down to a certain position, and the adjacent plunger adjusts the oil volume by adjusting the opening size of the channel.
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