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.

[LeKimberly]

If the fuel level sensor is broken, I would definitely replace it as soon as possible because I had a similar issue with my previous car. That time, while driving on the highway, the fuel gauge showed it was full, but suddenly I ran out of gas and broke down on the roadside—how dangerous! The sensor's role is to monitor the fuel tank level in real-time and alert you when to refuel. If it fails, you might underestimate the fuel level, leading to engine idling or increased wear, ultimately costing more to repair the engine. On modern cars, the sensor isn't expensive—replacing one costs just a few hundred bucks, which is much cheaper than misjudging fuel levels and wasting more gas. Plus, over the long term, a properly functioning sensor can help you save on fuel costs. I believe safety comes first; don’t take unnecessary risks over such a small issue. Regularly checking various sensors in your car can extend its lifespan and prevent accidents. In short, this isn’t a major repair—it’s a small expense to avoid big trouble. I strongly recommend replacing it promptly.

[JaxonMarie]

If the fuel level sensor is broken and not replaced, it might not be a big issue, but it depends on the specific situation. With a limited budget, I would weigh the options: if the sensor only occasionally gives false readings and there's a gas station nearby, you can still estimate refueling using the odometer, so you can hold off on replacing it for now. However, if it's completely broken and the fuel gauge doesn't work at all, it becomes a major hassle. It could cause you to overfill or underfill the tank, wasting money and, in severe cases, leading to engine overheating and damage. Replacing the sensor is relatively cheap, costing around 200–300 RMB, but repairing engine damage could run into thousands. So, I usually check first—if it's an old car not worth major repairs, I might let it go; for a new car, it's better to replace it early. Sometimes, you can buy the part yourself and ask a friend to help install it to save money. The key is to decide based on your driving habits and avoid delaying it to prevent higher costs later.

[VanEmilia]

I think the sensor must be replaced—it's too crucial. Inaccurate oil level readings could lead to incorrect refueling, potentially causing engine stalling and damage. For someone like me who often travels with family, imagine the hassle of running out of fuel on the highway! Replacement is straightforward—don't wait for a minor issue to escalate. Fix it early for peace of mind.