Is it necessary to replace a faulty fuel level sensor?

[LeRicardo]

Replacing a car's fuel level sensor can be challenging: 1. A malfunctioning fuel gauge is usually caused by a damaged fuel float, which is the fuel level sensor located inside the fuel tank. Replacing it requires opening the fuel tank; 2. In sedans, it's typically found either under the rear seats or inside the trunk. There's a small cover that, when opened, reveals the fuel float and fuel pump. If the fuel cap isn't securely sealed after replacing the float, gasoline can easily evaporate from there, leading to a stronger fuel odor; 3. The fuel gauge measurement works by a float connected to a metal rod, whose end is attached to a movable contact point on a variable resistor. The position of the float on the fuel surface in the tank changes, altering the position on the variable resistor via the metal rod. This variable resistor is connected to the fuel gauge, and the movement of the gauge's needle is controlled by the amount of current passing through the variable resistor.