What are the reasons for fuel injectors not spraying fuel?

2 Answers
DeAlexa
07/29/25 7:01am
Reasons for fuel injectors not spraying fuel: 1. Insufficient fuel: Generally, when the car's fuel warning light comes on, it can still travel about 40-50 kilometers. Therefore, many drivers continue driving without refueling when the light is on. If not handled properly, this can lead to severe fuel shortage in the tank, causing the fuel injectors to stop spraying fuel. 2. Fuel pump damage: The fuel pump relies on fuel for cooling and lubrication. Once the fuel level in the tank becomes critically low, the fuel pump is highly prone to damage. 3. High-pressure fuel pump failure: To increase the fuel injection pressure and improve fuel atomization, the fuel undergoes secondary pressurization through the high-pressure fuel pump before being injected by the injectors. If the high-pressure fuel pump fails, causing a sudden drop in fuel supply pressure, the fuel injection process will be affected. 4. Fuel injector clogging: Unsaturated olefins and gums in fuel can form a coking-like substance under high temperatures, commonly known as carbon deposits. When carbon deposits severely accumulate on the fuel injectors, clogging is highly likely to occur, thereby affecting the fuel injection process.
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KyleFitz
08/12/25 10:23am
Well, I've been driving for over a decade and have encountered the issue of fuel injectors not spraying fuel several times. It's quite annoying. The main reasons are: the fuel injector itself is clogged or damaged due to excessive carbon buildup preventing fuel from spraying; the fuel pump is broken and can't supply fuel (you won't hear the buzzing sound when starting the car); the fuel filter is too dirty blocking the fuel line (the pump might work but fuel can't reach the injectors); electrical issues like blown fuses or relay failure preventing current transmission; or ECU malfunction sending wrong signals causing injectors not to spray. When this happens, the car won't start, especially troublesome during cold morning starts. I suggest first checking simple components like replacing fuses in the fuse box. If that doesn't work, tow it directly to a repair shop without delay. For regular maintenance, it's best to periodically clean fuel injectors with additives and use high-quality gasoline to reduce carbon buildup, which can significantly lower failure rates and avoid affecting normal travel safety.
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