Overfilling the fuel tank can have some impact on the fuel gauge. It is not advisable to fill the tank to the brim, as this may cause the fuel float and sensor to malfunction, leading to inaccurate fuel gauge readings. Below is some information about refueling your car: Do not wait until the warning light comes on to refuel: Since the fuel pump is located inside the fuel tank and relies on gasoline for cooling and lubrication, having too little fuel can hinder the pump's normal operation and shorten its lifespan. It is not recommended to fill the tank completely: Gasoline expands when heated and evaporates into vapor under high summer temperatures, requiring space to accommodate this. If the tank is filled to the brim with no space left, gasoline vapor or even liquid fuel may enter the carbon canister for storage, which is not only wasteful but also harmful to the environment. Indication deviation: After routine activities such as replacing the battery or fuel filter, or even after parking overnight, you may notice that the fuel gauge needle is lower than the previous reading when restarting the car, leading you to suspect a malfunction. However, when the temperature drops or the fuel tank is opened, the pressure is released, causing the fuel level to drop. Therefore, such display deviations are normal. Generally, the deviation should not exceed the width of one needle.
