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What is the reason for the fuel gauge not showing full after filling up the tank?

2 Answers

Gage

09/01/25 7:08am

The reasons for the fuel gauge not showing full after filling up the tank are: 1. If the fueling speed is too fast, it will generate expanding vapor, and the gas displaced by the gasoline during fueling does not have enough time to be released; 2. The fuel gauge has a problem or the fuel gun is placed too shallow. The methods to open the fuel tank are: 1. Use the key to open it; 2. Press the fuel tank button inside the car to open it; 3. Directly press the fuel tank cap to open it. The structure of an automobile fuel tank consists of a fueling pipe, tank body, fuel tank cap, fuel gauge, and fuel pump. Automobile fuel tanks are divided into gasoline tanks and diesel tanks according to the different fuels. According to different structures, automobile fuel tanks are divided into: bite-type fuel tanks, aluminum alloy fuel tanks, CO2 welded fuel tanks, top-bottom butt joint fuel tanks, and two-end seam welded fuel tanks.

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DeclanRose

09/14/25 2:57am

I've been driving for half my life and have encountered several instances where the fuel gauge didn't show full even after topping up the tank. There are a few main reasons for this: The most common issue is a faulty fuel gauge sensor - the float can get stuck due to debris or become damaged, leading to inaccurate fuel level readings. Another cause is poor wiring connections, where corrosion or loose contacts prevent signal transmission. If the fuel tank's vent is clogged, trapped air during refueling can also affect the float's position. Additionally, instrument cluster malfunctions or car computer bugs may contribute. While these may seem minor, driving without accurate fuel readings risks unexpected fuel depletion and stalling, especially dangerous on highways. My advice is to observe after refueling. If this persists, don't delay - get the sensor and wiring checked immediately. If unsure, take it to a professional shop; small repair costs beat being stranded. By the way, regularly cleaning the fuel tank connections can help prevent this issue.

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