What Causes a Car Fuel Injector to Stop Spraying Fuel?

[CarlosLynn]

Reasons why a car fuel injector stops spraying fuel: 1. Injector nozzle clogging or fuel line connection leaks, leading to insufficient fuel supply; 2. Piston wear; 3. High-pressure fuel pump failure. During repairs, you can test whether the injector has positive voltage, as the vehicle's computer controls the injector's negative wire. If the injector has positive voltage but no negative signal, and there is currently high voltage present, the computer may need repair. For clogged injectors, a cleaning needle can be used to unclog them, followed by thorough cleaning. Modern car fuel injectors are essentially simple solenoid valves. When the solenoid coil is energized, it generates magnetic force, lifting the needle valve to open the nozzle. Fuel is then sprayed at high speed through the annular gap between the needle valve tip and the nozzle, forming a fine mist for optimal combustion.