Precautions - Mercury MerCruiser MCM 454 Mag MPI Service Manual

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MULTI-PORT FUEL INJECTION DISASSEMBLY AND REASSEMBLY

Precautions

Always disconnect battery cables from battery BEFORE working on fuel system to

prevent fire or explosion.

Be careful when cleaning flame arrestor and crankcase ventilation hose; gasoline

is extremely flammable and highly explosive under certain conditions. Be sure that

ignition key is OFF. DO NOT smoke or allow sources of spark or open flame in area

when cleaning flame arrestor and crankcase ventilation hose.

Be careful when changing fuel system components; gasoline is extremely flam-

mable and highly explosive under certain conditions. Be sure that ignition key is

OFF. DO NOT smoke or allow sources of spark or open flame in the area while

changing fuel filter(s). Wipe up any spilled fuel immediately.

Be sure that the engine compartment is well ventilated and that no gasoline vapors

are present to avoid the possibility of fire.

Make sure no fuel leaks exist, before closing engine hatch.

Fuel pressure MUST BE relieved before servicing high pressure component in the

fuel system.

DO NOT operate engine without cooling water being supplied to water pickup holes

in gear housing, or water pump impeller will be damaged and subsequent overheat-

ing damage to engine may result.

The following information MUST BE adhered to when working on the fuel system:

Always keep a dry chemical fire extinguisher at the work area.

Always install new O-rings when assembling fuel pipe fittings.

DO NOT replace fuel pipe with fuel hose.

DO NOT attempt any repair to the fuel system until instructions and illustrations

relating to that repair are thoroughly understood.

Observe all Notes and Cautions.

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SERVICE MANUAL NUMBER 23

90-861326--1 MARCH 1999

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