What is the reason for having fuel but the range not displaying?

[StJuliet]

If the range is not displaying, it could be due to a sensor issue or poor contact. Here are the relevant explanations: 1. Range: The range is data calculated by the computer based on the current fuel level, recent fuel consumption, current driving speed, road conditions, load, and other factors. It is highly influenced by external factors such as road conditions and can vary significantly, serving only as a rough estimate. 2. Sensor: A sensor is a detection device that can sense the measured information and convert it into electrical signals or other required forms of information output according to certain rules, to meet the requirements of information transmission, processing, storage, display, recording, and control.

[LaEsther]

This situation is quite common. I reckon it's mainly due to a faulty fuel level sensor. The sensor sits inside the fuel tank and over time can get clogged with sludge or debris, or the float inside might get stuck in one position. When the sensor data can't update, the ECU can't determine how much fuel is in the tank, so of course the range won't display. Wiring issues could also be the culprit, like rodents chewing the wires between the sensor and dashboard or loose connectors. Occasionally, the vehicle's computer might freeze up too - restarting the car might fix that. But the safest bet is to get to a repair shop ASAP and hook up a diagnostic scanner, just in case you actually run out of fuel someday while driving.

[DelAna]

Last week I encountered the same issue where the range wouldn't display after filling up. Turned out the sensor's sliding rail was rusted stuck. The mechanic said excessive moisture in the fuel tank causes this, with poor gasoline quality or consistently half-tank refills accelerating corrosion. Actually, the dashboard itself could malfunction too - either the display module burned out or a fuse blew. I even learned a DIY diagnostic trick: after powering on, observe if the fuel gauge needle moves. If it doesn't budge, it's likely a sensor problem; if it moves but range still won't show, then it's an ECU issue.

[Philip]

This may involve three modules: the sensor, dashboard, and onboard computer. Sensor malfunctions are the most common, as sulfides in gasoline can corrode the contacts, causing resistance values to become distorted. If the dashboard's backlight panel or circuit board burns out, it can also result in no display. The onboard computer will stop functioning if it fails to receive fuel level data or encounters program errors. Sometimes, a weak battery or unstable voltage can also affect the sensitivity of delicate electrical components. For self-inspection, first check if the fuel gauge needle drifts. Additionally, open the hood and inspect the grounding wires near the engine for looseness or rust, as this can interfere with signal transmission.

[OCollin]

As a driver who has been using an old car for years, I've encountered this embarrassing situation several times. It mainly falls into two categories: mechanical jamming and electrical faults. Mechanical jamming occurs when the metal float in the fuel tank gets stuck at a certain height. I've found that gently tapping the bottom of the fuel tank can temporarily fix it. For electrical issues, it's either the sensor itself short-circuiting or breaking, or the wiring harness connector oxidizing and making poor contact. A less common reason is heavy items in the trunk pressing on the wiring harness of the fuel pump assembly. When it can't be fixed immediately, you can temporarily use a mobile app to estimate fuel consumption and calculate how many kilometers you can drive with the current fuel level to cope with the emergency.

[McRicardo]

This issue is quite common in older vehicles, with the core problem lying in the fuel level sensor inside the tank. The small float's sliding mechanism along the track is particularly prone to malfunctions—either the contact points wear out causing unstable signals, or the spring fatigues and gets stuck at a certain position. Sometimes, washing the car immediately after refueling can cause the cold fuel tank to suddenly encounter cold water, creating negative pressure that sucks the float into place. Additionally, rough road conditions can loosen wiring connections, leading to intermittent failures. If restarting the vehicle doesn't help, try opening the door and rocking the car body side to side while stationary; this might dislodge a stuck float. Leaving it unaddressed long-term can affect fuel level estimation accuracy, so just pay extra attention to the actual fuel amount when refueling.