What force(s) hold an EHI nozzle needle seated in a standard CR system when the engine is stationary and there is no measurable rail pressure?
A) hydraulic pressure only
B) spring pressure only
C) electrical pressure only
D) combined spring and electrical force

Question

Quizplus · Accepted Answer

The force that holds an EHI nozzle needle seated in a standard Common Rail (CR) system when the engine is stationary and there is no measurable rail pressure is spring pressure. This is because, in the absence of hydraulic or electrical forces, the spring inside the injector ensures the needle remains in its seated position to prevent fuel from leaking through the injector.

What Force(s) Hold an EHI Nozzle Needle Seated in a Standard