Throttle Body Injection
System Description
!
WARNING
Be sure that the engine compartment is well ven-
tilated and that no gasoline vapors are present to
avoid the possibility of fire.
The fuel system consists of a fuel supply, tank, water
separating fuelfilter,electricfuelpump,pressurereg-
ulator, fuel injectors, throttle body and throttle posi-
tion (TP) sensor.
!
WARNING
Make sure no fuel leaks exist before closing en-
gine hatch.
Fuel is drawn from the boat’s fuel supply tank,
through a water separating fuel filter and fuel cooler,
by a electrical fuel pump.
!
CAUTION
A pressure regulator located on the fuel cooler main-
tains a constant fuel pressure. The fuel bled off from
the pressure regulator is delivered back to the water
separating fuel filter.
Fuel pressure MUST BE relieved before servicing
any component in the fuel system.
!
CAUTION
The throttle body is the component of the system
which supplies the air required for optimum fuel com-
bustion. The throttle body consists of a housing, two
injectors, two throttle plates, throttle plate linkage,
idle air control (IAC) valve and throttle position (TP)
sensor.
DO NOT operate engine without cooling water
being supplied to seawater pump or water pump
impeller will be damaged and subsequent over-
heating 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.
Service Precautions
!
WARNING
•
Always install new O-rings when assembling
fuel system parts.
Always disconnect battery cables from battery
BEFORE working on fuel system to prevent fire
or explosion.
•
•
DO NOT replace fuel pipe with fuel hose.
Always relieve system fuel pressure prior to
servicing any component in the fuel system.
!
WARNING
•
•
DO NOT attempt any repair to the fuel system
until instructions and illustrations relating to
that repair are thoroughly understood.
Be careful when cleaning flame arrestor and
crankcase ventilation hoses; gasoline is ex-
tremely 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 hoses.
Observe all Notes and Cautions.
!
WARNING
Be careful when changing fuel system compo-
nents; gasoline is extremely flammable and high-
ly 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.
Index
90-823224--2 796
ELECTRONIC FUEL INJECTION (MULTI-PORT AND THROTTLE BODY) - 5C-147
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 454 CID, Mercury MerCruiser 502 CID |
| Model Year | 1993, 1994, 1995, 1996, 1997 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
(4 votes, average: 4.5 out of 5)
Marine readers have rated 1993 1997 Mercury-MerCruiser GM V8 454 CID 7.4L and 502 CID 8.2L Marine Engines Service Manual Number 16 4.5 out of 5.0 based on 4 product reviews. Hugely helpful service manual! Perfect. Thank you!
Manuals are all Important for Technician
This book is invaluable if you do your own repairs. Great book.
Could not find a copy until a search brought me here.
Excellent print.
Thank you