Hombre S Regular Cab 4WD V6-4.3L (1999)
Fuel Injector: Description and Operation
Fuel Injector
Each fuel injector assembly is a solenoid-operated device, controlled by the control module. The fuel injector assembly meters the pressurized fuel
through a poppet nozzle valve (5) to a single engine cylinder. The control module energizes the flow control solenoid (2), which opens an armature valve
(3), allowing fuel to flow past the valve and through a flexible fuel pipe (1) to the poppet nozzle valve. An increase in fuel pressure causes the poppet
nozzle ball to open from its seat against the extension spring force. This allows the fuel to flow from the nozzle.
De-energizing the flow control solenoid (2) closes the armature valve (3). De-energizing the solenoid also reduces the fuel pressure acting on the poppet
nozzle ball. The extension spring closes the ball to the seat. The extension spring also checks the pressure between the ball and seat of the poppet nozzle
valve (5) and the injector armature (3) and seat (4).
