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Why does the fuel gauge suddenly show empty when there's still half a tank of gas?

2 Answers

OLeila

09/06/25 2:25am

If the fuel gauge suddenly shows empty when there's still half a tank of gas, it may be due to poor contact of the fuel pump's float-like component in the fuel tank. If this situation occurs frequently, it should be repaired. Related information: 1. Introduction: The fuel pump is a lightweight and compact pump, mainly divided into three types: in-line, distributor, and unit pumps. The fuel pump requires a power source to operate, and its lower camshaft is driven by the engine's crankshaft gear. 2. Details: The fuel pump features a housing made of aluminum-containing material and a movable molded part inside the housing. This movable part is at least partially made of a sinterable, iron-based alloy material containing austenite, and the sinterable material of this part has a thermal expansion coefficient at least 60% of that of the housing.

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DiSawyer

09/18/25 2:29am

I've encountered a similar situation before. While driving, the fuel gauge suddenly dropped from half a tank to the red zone, which scared me into rushing to a gas station. Later, the mechanic said it was most likely a faulty fuel level sensor - either the float got stuck in the fuel tank or had poor contact, causing inaccurate readings. Additionally, electrical circuit issues like loose wiring or fuse connections could also cause this. Using low-quality gasoline regularly can lead to fuel residue buildup on the sensor, interfering with signals. Try turning the engine off and restarting to see if it resets. If that doesn't work, you'll need professional inspection of the sensor and wiring. Always refuel at reputable gas stations to avoid sensor contamination from impurities. Remember to address this promptly - you don't want to suddenly run out of fuel on the highway, leaving you in a real dilemma.

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