FUEL INJECTION DESCRIPTIONS AND SYSTEM OPERATION
SERVICE MANUAL NUMBER 24
FUEL INJECTORS
The EFI injector assembly is a solenoid-operated device, controlled by the ECM, that meters
pressurized fuel to a single engine cylinder. The ECM grounds the injector solenoid, which
opens a pintle valve, allowing fuel to flow past the pintle valve. The injector tip has holes that
control the fuel flow, generating a conical spray pattern of finely atomized fuel at the injector
tip. Fuel is directed at the intake valve, causing it to become further atomized and vaporized
before entering the combustion chamber.
An injector that is stuck partly open will cause loss of pressure after engine shutdown. This
can result in long cranking times. Dieseling can also occur, because some fuel might be de-
livered to the engine after the ignition is turned OFF.
s
r
q
p
o
n
l
m
k
j
i
g
h
f
e
d
c
b
a
72970
MEFI 1 Injector Shown
a - Nozzle
b - Cap
c - O-Ring
d - Valve Stopper
e - Core
f - O-Ring
g - Spring
h - Housing
i - Solenoid Coil
j - Tape
k - Bobbin
l - O-Ring
m - Inner Collar
n - Sleeve
o - Terminal
p - Connector
q - Filter
r - O-Ring
Index
Page 5D-32
90-861327 OCTOBER 1999
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 305 CID, Mercury MerCruiser 350 CID |
| Model Year | 1998, 1999, 2000, 2001 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
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Marine readers have rated Mercury MerCruiser Engines Service Manual Number 24 GM V-8 305 CID 350 CID 4.0 out of 4.0 based on 1 product reviews. Great performance engine.
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