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ford fuel level gauge
Ford fuel gauge E stands for empty fuel, F stands for full fuel. The fuel gauge is used to indicate the amount of fuel in the car's fuel tank.
The fuel float, which is something similar to a water tank float, is installed outside the fuel pump. The main component is a connecting rod that can be rotated. There is a sliding resistance at the rotating shaft of the connecting rod, which returns a resistance value according to different angles of the connecting rod. The resistance return signal must be continuous, so there are trip computers and automobiles, all of which memorize the position of the fuel gauge in the computer, and compare the stored value of the computer with the return value of the fuel float every time it is started.
If the difference is lower than the control error, it will be displayed according to the stored value; if the difference is larger, the fuel gauge display will be restored to the position most connected to the return value of the fuel float among the 8 gears. During the driving process of the vehicle, the on-board computer calculates the fuel consumption according to the fuel consumption information of the engine, and continuously adjusts the display of the fuel gauge. This is why when the fuel float returns the wrong value, the fuel gauge may not move at full, or it may have been lowered this time, and the fuel gauge will rise again after the next start.
If the fuel float is stuck at P7P8 all the time, and then drops to P5 after running half a tank of fuel, the fuel gauge will always be full and then turn to half at once. If the fuel float is stuck at P2, the fuel gauge still warns after filling up. Now let's talk about how the fuel float can return the wrong value. Because the sliding resistance changes with the fuel float link, it must be exposed to gasoline in the tank. Gasoline always contains a certain amount of wax, especially low-quality gasoline, or posing as gasoline with low grade, will add more wax to improve the deflagration point. These excess wax will gradually deposit in the fuel tank, and when deposited on the sliding resistance, it will cause the resistance return value to be inconsistent with the position of the fuel float connecting rod. If the deposition is relatively uniform, the return value of the fuel float will drift as a whole. The sedimentation is serious and even the fuel float is completely stuck, resulting in the wrong display of the fuel gauge mentioned above.
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