Vacuum Line Routing; 7.4L Mpi Models - Mercury MerCruiser MCM 454 Mag MPI Service Manual

MULTI-PORT FUEL INJECTION DISASSEMBLY AND REASSEMBLY
INSTALLATION
1. Install ECT sensor in intake manifold. TIGHTEN HAND TIGHT PLUS 2-1/2 TURNS
MAXIMUM.
2. Connect electrical connector to ECT sensor.

Vacuum Line Routing

7.4L MPI Models

Index
Page 5C-56
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b
a - Engine Coolant Temperature (ECT) Sensor
b - Harness Connector
c
f
h
g
d
a - Plenum
b - Cool Fuel Assembly
c - Vacuum Hose - T-Fitting to Fuel Pressure Regulator on Cool Fuel Assembly
d - Vent Hose - Valve Cover to Throttle Body Adapter
e - Vent Hose - Front of Plenum to PCV Valve
f - Vacuum Hose - Fuel Pressure Damper to T-Fitting
g - Vacuum Hose - T-Fitting to Plenum
h - T-Fitting
i - Front of Engine
a
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b
i
SERVICE MANUAL NUMBER 23
e
a
75728
75740
90-861326--1 MARCH 1999
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