454/502 Mag Mpi And 8.2L Mpi Multi-Port Injection Components - Mercury MerCruiser MCM 454 Mag MPI Service Manual

SERVICE MANUAL NUMBER 23

454/502 Mag MPI and 8.2L MPI Multi-Port Injection Components

FUEL PUMP ELECTRICAL CIRCUIT
When the ignition switch is turned to the RUN position, the ECM will turn ON the fuel pump
relay for two (2) seconds.
When the ignition switch is turned to the crank position, the ECM turns the fuel pump relay
ON causing the fuel pump to start.
If the ECM does not receive ignition reference pulses (engine cranking or running), it shuts
OFF the fuel pump relay, causing the fuel pump to stop.
FUEL RAIL / INTAKE MANIFOLD ASSEMBLY
The fuel rail performs several functions. It positions the injectors in the intake manifold and
distributes fuel evenly to the injectors.
Index
90-861326--1 MARCH 1999
Downloaded from https://needmanual.com/
d
MEFI 1 Shown, MEFI 3 Similar
a - Fuel Rail
b - Pressure Regulator
c - Fuel Injector
d - Intake Manifold
MULTI-PORT FUEL INJECTION DESCRIPTIONS AND SYSTEM OPERATION
a
b
c
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