SERVICE MANUAL NUMBER 23
MULTI-PORT FUEL INJECTION DESCRIPTIONS AND SYSTEM OPERATION
454/502
Mag MPI and 8.2L MPI Multi-Port Injection Components
FUEL PUMP ELECTRICAL CIRCUIT
When the ignition switch is turned to the RUN position, the ECM will turn ON the fuel pump
relay for two (2) seconds.
When the ignition switch is turned to the crank position, the ECM turns the fuel pump relay
ON causing the fuel pump to start.
If the ECM does not receive ignition reference pulses (engine cranking or running), it shuts
OFF the fuel pump relay, causing the fuel pump to stop.
FUEL RAIL / INTAKE MANIFOLD ASSEMBLY
The fuel rail performs several functions. It positions the injectors in the intake manifold and
distributes fuel evenly to the injectors.
a
b
c
d
72799
MEFI 1 Shown, MEFI 3 Similar
a - Fuel Rail
b - Pressure Regulator
c - Fuel Injector
d - Intake Manifold
90-861326--1
MARCH 1999
Page 5B-35
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 454 CID, Mercury MerCruiser 502 CID |
| Model Year | 1998, 1999, 2000, 2001 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
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