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ELECTRONIC FUEL INJECTION (EFI)
SCHRADER VALVE
INJECTOR
TO DISTRIBUTOR
STEPPER MOTOR
MAP SENSOR
FUEL PRESSURE REGULATOR
THROTTLE BODY
AIR HEATER
PCV VALVE
AIR SCREEN/
FLAME ARRESTOR
1i~::::::=
NOTE: FAILURE TO KEEP CLEAN
II
WILL RESULTIN A HIGH INTAKE
. . ;r--...::-___
DRAW ENGINE LUBE OIL INTO THE INTAKE AND BE CONSUMED
BY THE ENGINE THROUGH THE PVC CRANKCASE VENTING VALVE.
CLEAN THIS SCREEN ON A REGULAR BASIS.
COOLANT FEED
DESCRIPTION
The above illustration shows the throttle body assembly
attached to the intake manifold.
An
electronic control unit (BCU) controls the fuel injection
and throttle actuator.
The
ECU
is supplied with electrical signals it interprets as
engine operating conditions from sensors that monitor intake
air tempemture, engine coolant tempemture, map sensor
(intake manifold absolute pressure), engine rpm, battery
voltage and distributor cam signal.
The ECU interprets this information to determine the
appropriate injector pulse mte and throttle opening position.
A high
pressure fuel pump supplies fuel to the area around
the injector and regulator maintains the fuel pressure in that
area at 35 - 40 PSI.
caC/LAln RETURN
The injector is a solenoid operated pintle valve that meters
fuel into the intake manifold depending on engine operating
conditions and generator amperage load as determined by the
ECU.
Air flow into the intake manifold is controlled by the ECU
operation of the throttle plate via the actuator. Throttle plate
positioning for proper air flow into the engine is
accomplished through the ECU interpretation of engine
operating conditions. The Schrader valve is used to
monitor/check fuel pressure around the fuel injector.
~
WESTERBEKE
Engines
&
Generators
16
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