Fuel Supply Connections; Replacement Parts Warning; Precautions - Mercury MerCruiser MCM 454 Mag MPI Service Manual

Table of Contents

SERVICE MANUAL NUMBER 23

Fuel Supply Connections

Avoid gasoline fire or explosion. Improper installation of brass fittings or plugs into

fuel pump or fuel filter base can crack casting and/or cause a fuel leak.

Electrical, ignition and fuel system components on your MerCruiser are designed

and manufactured to comply with U.S. Coast Guard Rules and Regulations to mini-

mize risks of fire and explosion.

Use of replacement electrical, ignition or fuel system components, which do not

comply with these rules and regulations, could result in a fire or explosion hazard

and should be avoided.

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

prevent fire or explosion.

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 flame in the area while chang-

ing fuel filters. Wipe up any spilled fuel immediately.

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

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

pump, or pump impeller will be damaged and subsequent overheating damage may

90-861326--1 MARCH 1999

Downloaded from

https://needmanual.com/

Apply #592 Loctite Pipe Sealant with Teflon to threads of brass fitting or plug.

DO NOT USE TEFLON TAPE.

Thread brass fitting or plug into fuel pump or fuel filter base until finger tight.

Tighten fitting or plug an additional 1-3/4 to 2-1/4 turns using a wrench. DO NOT

OVER-TIGHTEN.

Install fuel line. To prevent over-tightening, hold brass fitting with suitable

wrench and tighten fuel line connectors securely.

Check for fuel leaks.

FUEL DELIVERY SYSTEM FOR ELECTRONIC FUEL INJECTION

Table of Contents