Electrical Connections; Fuel Supply Connections - Mercury MerCruiser MCM 454 Mag MPI Service Manual

Table of Contents

MIE MODELS - VELVET DRIVE TRANSMISSION

Electrical Connections

1. Connect instrument harness to engine harness with hose clamp. Tighten clamp

7.4L MPI Shown

Be careful when working on fuel system. Gasoline is extremely flammable and

highly explosive under certain conditions. Do not smoke or allow spark or open

flame in area. Wipe up any spilled fuel immediately.

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

OVERTIGHTEN.

Install fuel line. To prevent overtightening, hold brass fitting with suitable

wrench and tighten fuel line connectors securely.

Check for fuel leaks.

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.

1. Connect fuel line from fuel tank(s) to engine. Ensure connections are secure. Check for

Downloaded from

https://needmanual.com/

Instrumentation Wiring Harness Plug

Fuel Inlet Hose Connects Here

SERVICE MANUAL NUMBER 23

90-861326--1 MARCH 1999

Table of Contents