What could be the reason for suddenly showing no fuel when the tank is half full?

2 Answers
Nancy
07/24/25 10:43pm
If the fuel gauge suddenly shows no fuel when the tank is half full, it might be due to poor contact of the fuel pump's float-like component. If this issue persists, it should be repaired. The fuel pump is a lightweight and compact pump, categorized mainly into inline, distributor, and unit types. The fuel pump requires a power source to operate, with its lower camshaft driven by the engine's crankshaft gear. Introduction to the functions of the fuel pump: 1. The fuel pump is suitable for transporting various oils, such as heavy oil, diesel, and lubricating oil. With copper gears, it can transport low-flash-point liquids like gasoline and benzene. Some models with stainless steel gears can also transport beverages and corrosive liquids. 2. The fuel pump can also handle liquids containing hard particles or fibers and is suitable for various viscosities. It can withstand temperatures up to 300°C. For transporting high-temperature liquids, high-temperature resistant gear pumps are recommended, capable of handling liquids below 300°C. 3. Many types of fuel pumps feature simple and compact structures, are easy to use and maintain, and have good self-priming capabilities, eliminating the need to fill the pump with liquid before each use. 4. Some fuel pumps are lubricated automatically by the transported liquid, so no additional lubricant is needed during regular operation. 5. Using flexible couplings to transmit power can compensate for minor deviations caused during installation. It also provides effective buffering against unavoidable hydraulic impacts during pump operation.
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MichaelFitz
08/10/25 3:08pm
The car issue I encountered this time is really frustrating: half a tank of gas but suddenly showing empty, usually due to the fuel level sensor's float getting stuck in position, causing inaccurate readings; or aging, loose wiring leading to a short circuit, sending false signals to the dashboard. Older cars' electronic components are prone to this, especially in cold weather when metal contracts and is more likely to jam. The solution is simple: first, drive to level ground, turn off the engine, and restart it to see if it helps; if not, don’t delay—take it to a repair shop to check the entire fuel system. Safety should never be taken lightly, as false alarms might lead to misjudgments like stalling on the road. Preventive measures include observing the fuel gauge response after each refuel and regular maintenance to ensure the sensor moves freely. Don’t underestimate this issue; fix it early to avoid more expensive repairs later.
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