Mercury MerCruiser MCM 454 Mag MPI Service Manual page 518

SERVICE MANUAL NUMBER 23
5. When facing front of engine, remove fuel rail as follows:
NOTE: The left bank fuel injectors are to remain fully seated in the fuel rail throughout
removal, while the right bank fuel injectors are to remain fully seated in the intake manifold
throughout removal.
CLEANING AND INSPECTION
Inspect fuel injector seating area in fuel rail for pitting, nicks, burrs or irregularities, use a
magnifying glass if necessary. If any of the above are present, replace the fuel rail.
INSTALLATION
NOTE: Before installing fuel injectors, lubricate new fuel injector O-rings using a water/soap
solution.
1. When standing at front of engine, install fuel rail as follows:
Index
90-861326--1 MARCH 1999
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a. Working from front of engine to rear, slide the first front right bank fuel injector from
the fuel rail. Next, slide the first front left bank fuel injector from the intake manifold.
Continue sliding fuel injectors from their respective bores working back and forth
toward rear of engine until fuel rail is free.
a - Fuel Rail
b - Intake Manifold
c - Front Right Bank Fuel Injector
d - Front Left Bank Fuel Injector
a. Install four left bank fuel injectors into left bank of fuel rail.
b. Install four right bank fuel injectors into right bank of intake manifold.
MULTI-PORT FUEL INJECTION DISASSEMBLY AND REASSEMBLY
b
a
c
d
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