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What are the reasons for a car fuel injector not spraying fuel?

1 Answers

DeJoanna

07/30/25 4:03am

Car fuel injectors may fail to spray fuel due to insufficient fuel, damaged fuel pump, high-pressure fuel pump malfunction, clogged fuel injector, or air leakage at the fuel line connection. Below is more information about car fuel injectors: 1. Introduction: The fuel injector itself is a normally closed valve, with its opening and closing controlled by the up-and-down movement of a valve needle. When the electromagnetic coil is energized, it generates suction force, lifting the needle valve to open the injection hole. Fuel is then sprayed at high speed through the annular gap between the needle valve head and the injection hole, forming a mist that facilitates complete combustion. 2. Causes of seizure: Unclean diesel fuel or impurities in the high-pressure fuel line can prevent the needle valve assembly from sealing properly, allowing high-pressure combustion gases to backflow and damage the needle valve assembly. Additionally, contaminants on components such as the injector pressure-regulating spring or tappet can move to the upper part of the injector needle valve via the injector tappet, or cotton threads or lead wires used to prevent oil leakage in the fuel line can enter the injector through the high-pressure fuel line, causing the needle valve assembly to seize.

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