Fuel System
Section
3A - Fuel System Operation
Table of Contents
Theory of Operation........................................................... 3A-2
Air Induction System...................................................
3A-2
Fuel System................................................................3A-2
Fuel Pump.................................................................. 3A-2
Vapor Separator Tank................................................ 3A-2
Throttle Body.............................................................. 3A-3
Engine Control Module (ECM)........................................... 3A-3
Overview.....................................................................3A-3
ECM and Fuel Injection.............................................. 3A-3
Troubleshooting.......................................................... 3A-4
Additional Information................................................. 3A-4
Sensors..............................................................................3A-4
Crankshaft Position Sensor (CPS)............................. 3A-4
Engine Coolant Temperature (ECT) Sensor...............3A-4
Temperature and Manifold Absolute Pressure
(TMAP) Sensor....................................................... 3A-4
Throttle Position Sensor (TPS)................................... 3A-4
Actuators............................................................................3A-4
Function of Actuators..................................................3A-4
Idle Air Control (IAC)...................................................3A-4
Fuel Injector................................................................ 3A-5
Fuel System Operation
90-8M0125265 eng NOVEMBER 2017 © 2018 Mercury Marine Page 3A-1
3
A
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