Mercury 15 EFI FourStroke, Service Manual

Page: 116 / 406

• Functions as an electronic dashpot by providing additional bypass air as the throttle quickly closes during a rapid
deceleration, preventing engine stalling.
62991
Fuel Injector
The fuel injector is an electrically‑operated, spring‑loaded solenoid that delivers a metered amount of fuel into the intake
manifold runner, just ahead of the intake valve. The injectors are electrically charged by the ECM through the stator assembly
when the flywheel starts to rotate. The ECM controls the injection by completing the ground circuit, lifting the solenoid, which
allows high‑pressure fuel to flow through the fuel injector. The ECM then opens the ground circuit, allowing the spring to close
the injector and stop the fuel flow.
An injector filter screen is located on the fuel inlet side of the injector. The filter screen is not replaceable, but can be cleaned of
debris.
21100
Fuel System Operation
90-8M0125265 eng NOVEMBER 2017 © 2018 Mercury Marine Page 3A-5