What Causes Fuel Injector Leakage?

[LolaAnn]

Fuel injector leakage is caused by unclean engine oil, poor cooling of the injector due to excessive engine temperature, wear of the delivery valve, and missing or damaged gaskets during injector installation. Unclean engine oil: Impurities in the high-pressure fuel line prevent the needle valve assembly from sealing properly, allowing high-pressure combustion gases to backflow and damage the needle valve assembly. Additionally, contaminants on the injector's pressure-regulating spring and tappet can contribute to the issue. Excessive engine temperature and poor injector cooling: Factors such as delayed fuel supply timing, excessive scaling or blockage in the cooling water passages, wear on the water pump impeller, and prolonged engine overloading can exacerbate the problem. Wear of the delivery valve: This can lead to dripping after the injector stops spraying fuel, causing carbon buildup on the injector nozzle and potentially leading to seizure. Missing or damaged gaskets during injector installation: This results in air leakage, causing localized overheating of the injector and subsequent seizure.