ELECTRONIC FUEL INJECTION COMPONENTS

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ELECTRONIC FUEL INJECTION COMPONENTS
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THE FOLLOWING ARE THE MOST COMMON FUEL INJECTION
COMPONENTS FOR MULTI PORT FUEL INJECTION STARTING
AT THE GAS TANK!
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ELECTRIC FUEL PUMPS PURPOSE- PUMPS FUEL UNDER
HIGH PRESSURE TO FUEL PRESSURE REGULATOR. THERE
ARE THREE BASIC SYSTEMS INTANK HIGH PRESSURE
PUMP, FOR SINGLE GAS TANK APPPLICATIONS. FRAME
MOUNTED HIGH PRESSURE PUMP, FOR SINGLE GAS TANK
APPLICATIONS, AND LOW PRESSURE ELECTRIC FUEL
PUMPS IN EACH GAS TANK ( PICK UP AND TRUCK
APPLICATIONS ) AND A FRAME MOUNTED HIGH PRESSURE
FUEL PUMP. WHICH HAS A ELECTRIC SWITCHING
VALVE MOUNTED ON THE FRAME RAIL IN FRONT OF THE
PUMP.
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IN TANK HIGH PRESSURE ELECTRIC FUEL PUMP, CAPABLE
OF OVER 100psi.
WIRE TERMINALS
Fuel inlet
Fuel outlet
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FRAME MOUNTED HIGH PRESSURE FUEL PUMP CAPABLE OF
over 100 psi.
ELECTRICAL CONNECTOR
FUEL INLET
FUEL OUTLET
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FUEL TANK SWITCHING VALVE
TO FUEL PUMP FUEL RETURN FROM REGULATOR
SOURCE RETURN TO ONE OF THE GAS TANKS
SOURCE RETURN TO ONE OF THE GAS TANKS
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FUEL PRESSURE REGULATOR PURPOSE - REGULATES FUEL
PRESSURE TO MANUFACTURES SPECIFICATIONS, BY
RETURNING EXCESS FUEL PRESSURE TO THE GAS TANK..
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FUEL PRESSURE REGULATOR AND FUEL RAIL
VACUUM HOSE CONNECTION
FUEL RAIL
FUEL RETURN
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• INJECTORS AND FUEL RAIL PURPOSE - SUPPLIES
  FUEL UNDER REGULATED PRESSURE TO THE COMBUSTION
  CHAMBER OF EACH CYLINDER.

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FUEL RAIL, INJECTORS, FUEL INLET AND PRESSURE
REGULATOR
PRESSURE REGULATOR FUEL RETURN
FUEL INLET HIGH PRESSURE
FUEL RAIL
FUEL INJECTOR
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FUEL RAIL, INJECTORS, AND SCHRADER VALVE FITTING
FOR FUEL PRESSSURE GAUGE.
FUEL RAIL
SCHRADER VALVE
INJECTOR
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TYPICAL FUEL INJECTOR
FUEL INLET FROM FUEL RAIL, USES O-RINGS
FOR SEALS

ELECTRICAL CONNECTOR
FUEL OUTLET - FUEL COMES OUT AS A VERY FINE MIST
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THE FOLLOWING ARE ELECTRONIC FUEL INJECTION
COMPONENTS FOR THE AIR INTAKE. STARTING AT THE
AIR CLEANER.
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MASS AIR FLOW SENSORPURPOSE - MEASURES AIR SPEED
AND DENSITY CHANGES THE RETURNING VOLTAGE SIGNAL
TO THE E.C.M. ALLOWS FINE TUNE OF AIR / FUEL
MIXTURE, NOT USED ON ALL CARS.
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TOP VIEW AND INLET VIEWS OF MASS AIR FLOW SENSORS
NOTE DIRECTION OF ARROW INDICATES AIR FLOW
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VANE AIR FLOW SENSOR PURPOSE - USED ON SOME
IMPORTS TO DETERMINE AIR FLOW BY MOVING A DOOR
WHICH CHANGES THE VOLTAGE GOING BACK TO THE E.C.M.
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VANE AIR FLOW SENSOR IS A
VARIABLE RESISTOR, IT VARIES RETURNING VOLTAGE
TO THE ECM, VOLTAGE CHANGES WITH AIR FLOW
BOLTS TO AIR CLEANER HOUSING. AIR INLET
AIR OUTLET TO MOTOR - HOSE MUST BE CONNECTED
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THROTTLE BODY PURPOSE - IS A DIRECT LINK TO THE
GAS PEDAL - CONTROLS THE AMOUNT OF AIR GOING INTO
THE ENGINE.
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THROTTLE BODY / THROTTLE POSITION SENSOR IDLE
AIR CONTROL MOTOR INLET VIEW
THROTTLE LINKAGE - ATTATCHES TO THROTTLE CABLE
TPS SWITCH
IDLE AIR CONTROL MOTOR IAC
AIR INLET FROM AIR CLEANER
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TOP SIDE VIEW THROTTLE BODY IDLE AIR CONTROL
THROTTLE POSITION SWITCH
IAC MOTOR
TPS SWITCH
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TOP VIEW OF THROTTLE BODY NAME THE COMPONENTS
A IS
B IS
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THROTTLE POSITION SENSOR PURPOSE - BY CHANGING
THE VOLTAGE RETURNING TO THE COMPUTER IT ALLOWS
THE COMPUTER TO TELL THE PERCENTAGE OF THROTTLE
PLATE OPENING. MOUNTED OPOSITE OF THROTTLE CABLE
ON THE THROTTLE BODY.
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TPS SWITCH ( THROTTLE POSITION SENSOR )
ELECTRICAL CONNECTOR MOUNTING HOLES
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BACK SIDE OF THROTTLE POSITION SWITCH ( TPS )
SWITCH
HOLE FOR THROTTLE SHAFT - THIS TURNS AS YOU
ACCELERATE
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MANIFOLD AIR PRESSURE SENSORPURPOSE - CHANGING
VACUUM PRESSURE IN THE INTAKE MANIFOLD CHANGES
THE AMOUNT OF VOLTAGE GOING BACK TO THE E.C.M.
ALLOWS FOR FINE TUNING OF THE AIR - FUEL RATIO.
( MAP SENSOR )
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MAP SENSOR
VACUUM HOSE CONNECTION
ELECTRICAL CONNECTOR
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BAROMETRIC PRESSURE SENSOR PURPOSE - CHANGING AIR
PRESSURE SUCH AS CHANGES IN WEATHER,
TEMPERATURE, AND ELEVATION CHANGES THE VOLTAGE
RETURNING TO THE E.C.M.
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BARO SENSOR ( BAROMETRIC PRESSURE SENSOR )
NO VACUUM HOSE ATTATCHED
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IDLE AIR CONTROL MOTORPURPOSE - IS A COMPUTER
CONTROLED MOTOR THAT CAUSES A CONTROLED VACUUM
LEAK FROM ONE SIDE OF THE THROTTLE BODY TO THE
OTHER. IT IS MOUNTED ON THE THROTTLE BODY
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IAC MOTORS ( IDLE AIR CONTROL ) PROVIDES A
CONTROLED VACUUM LEAK TO ADJUST IDLE SPEED.
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INTAKE AIR TEMPERATURE SENSORPURPOSE - THE
VOLTAGE GOING BACK TO THE COMPUTER CHANGES WITH
THE CHANGING AIR TEMPERATURE. ALLOWS FINE TUNING
OF AIR TO FUEL RATIO. MOUNTED IN THE INTAKE
MANIFOLD
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INTAKE AIR TEMPERATURE SENSOR
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ENGINE COOLANT TEMPERATURE SENSORPURPOSE - THE
VOLTAGE GOING BACK TO THE COMPUTER CHANGES WITH
THE CHANGING COOLANT TEMPERATURE. DETERMINES WHEN
THE E.C.M. GOES INTO CLOSED LOOP, ABOUT 190- 200
DEGRESS
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ENGINE TEMPERATURE SENSOR USUALLY MOUNTED ON THE
THERMOSTAT HOUSING OR ON THE FRONT OF THE
MOTOR IN THE COOLANT FLOW
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THERMOSTAT HOUSING AND ENGINE COOLANT TEMPERATRE
SENSOR
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OXYGEN SENSOR PURPOSE - MONITORS THE AMOUNT OF
OXYGEN IN THE EXHAUST. THE ENGINE MAY HAVE MORE
THAN ONE. PRODUCES A VOLTAGE WHICH CHANGES WITH
THE AMOUNT OF OXYGEN. MAY BE HEATED.
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HEGO HEATED EXHAUST GAS OXYGEN SENSOR
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SINGLE WIRE O2 SENSOR ( NOT HEATED )
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KNOCK SENSORPURPOSE - SENDS SIGNAL TO THE
COMPUTER ( ECM ) WHEN IT DETECTS PINGING ( ENGINE
KNOCK ) ECM WILL RETARD TIMING UNTILL IT STOPS.
USUALLY MOUNTED ON THE SIDE OF THE ENGINE BLOCK.
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KNOCK SENSOR TOP VIEW, SIDE VIEW, AND BOTTOM VIEW
SINGLE WIRE ELECTRICAL CONNECTOR
SIDE VIEW
BOTTOM VIEW NOTE NO HOLE
THREADS
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EXHAUST GAS RECIRCULATION VALVEPURPOSE -
RECIRCULATES EXHAUST GASES TO REBURN IN THE
ENGINE. HELPS REDUCE EMISSIONS. MAY BE CONTROLED
BY THE E.C.M.
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TWO STYLES OF E.C.M. CONTROLED E.G.R. VALVES (
EXHAUST GAS RECIRCULATION VALVES )
ELECTRICAL CONNECTORS
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MISCELLANEOUS FUEL INJECTION COMPONENTS
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INERTIA SWITCH ( FORD ) PURPOSE - TO SHUT THE
POWER OFF TO THE ELECTRIC FUEL PUMP, IN AN
ACCIDENT
MAY BE ACCIDENTALY TRIPPED ON A ROUGH ROAD OR?
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E.F.I. FUEL FILTER PURPOSE TO KEEP THE FUEL
GOING TO THE INJECTORS CLEAN
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THE BRAINS
E.C.M. ELECTRONIC CONTROL MODULE
WHAT IT CONTROLS THE INJECTOR
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THE PURPOSE OF ALL OF THE COMPONENTS IS TO ALLOW
THE E.C.M. TO ADJUST THE AIR / FUEL RATIO TO
OBTAIN THE MOST POWER, THE BEST FUEL ECONOMY,
AND THE LEAST AMOUNT OF EMISSIONS
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AN ALTERNATIVE FUEL INJECTION SYSTEM IS THE
THROTTLE BODY FUEL INJECTION SYSTEM. IT HAS LESS
COMPONENTS MAKES MORE POWER AT LOWER R.P.M.s AND
GETS LESS MILES PER GALLION OF GAS.
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THROTTLE BODY FUEL INJECTION UNIT- MOUNTS THE
SAME AS A CARBURETOR
FUEL INLETS AND OUTLETS
PRESSURE REGULATOR
T.P.S. SWITCH
INJECTORS
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T.B.I. ( THROTTLE BODY FUEL INJECTION ) THE HEART
OF THE SYSTEM IS THE T.B.I. UNIT THE BRAINS OF
THE SYSTEM IS THE E.C.M. THIS SYSTEM HAS FEWER
COMPONENTS, THAN MULTI PORT E.F.I.