Fuel Pressure Relief Procedure; 454 / 502 Mag Mpi Multi-Port Components; Flame Arrestor - Mercury MerCruiser MCM 454 Mag MPI Service Manual

MULTI-PORT FUEL INJECTION DISASSEMBLY AND REASSEMBLY

Fuel Pressure Relief Procedure

1. Disconnect electrical connector at fuel pump.
2. Crank engine for ten seconds (if engine starts allow it run until it stops) to relieve any
fuel pressure in the system.

454 / 502 Mag MPI Multi-Port Components

Flame Arrestor

REMOVAL
Remove four flame arrestor mounting cap nuts and flame arrestor from throttle body.
CLEANING AND INSPECTION
Clean flame arrestor in solvent and dry with compressed air.
INSTALLATION
1. Install flame arrestor to throttle body.
2. Apply Loctite 242 to threads of studs. Install four flame arrestor mounting cap nuts.
Torque cap nuts to 50 lb-in. (6 Nm).
Index
Page 5C-8
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Refer to "Precautions" in this section, BEFORE proceeding.
Refer to "Precautions" in this section, BEFORE proceeding.
b
a - Flame Arrestor
b - Cap Nuts (4)
NOTICE
NOTICE
a
SERVICE MANUAL NUMBER 23
72790
90-861326--1 MARCH 1999