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FUEL INJECTION SYSTEM OPERATION

FUEL INJECTION SYSTEM OPERATION. FUEL INJECTION TYPES. THROTTLE BODY INJECTION (TBI) INJECTED ABOVE THROTTLE PLATES SINGLE INJECTOR CENTRAL PORT INJECTION (CFI) INJECTED ABOVE THROTTLE PLATES USUALLY MORE THAN ONE INJECTOR PORT FUEL INJECTION (PFI) INJECTORS IN INTAKE RUNNERS.

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FUEL INJECTION SYSTEM OPERATION

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  1. FUEL INJECTION SYSTEM OPERATION

  2. FUEL INJECTION TYPES • THROTTLE BODY INJECTION (TBI) • INJECTED ABOVE THROTTLE PLATES • SINGLE INJECTOR • CENTRAL PORT INJECTION (CFI) • INJECTED ABOVE THROTTLE PLATES • USUALLY MORE THAN ONE INJECTOR • PORT FUEL INJECTION (PFI) • INJECTORS IN INTAKE RUNNERS

  3. TBI UNIT(SOMETIMES CALLED CFI) • FIRST STEP FROM CARBURETORS • SOME CARB CHARACTERISTICS • LOW PRESSURE • MOVEABLE PINTLE • PRESSURE IS REGULATED • SERVICEABLE FIG 6-40 CLASS

  4. LOW PRESSURE SYSTEM

  5. FUEL INLET AND OUTLET

  6. LOW PRESSURE FUEL INJECTOR • 13-16 PSI • TWO O-RINGS • BALL PINTLE • USED ON TBI AND CFI SYSTEMS • MESH SCREEN • EASY TO REPLACE

  7. TWO INJECTOR SYSTEM

  8. PORT FUEL INJECTION • INJECTS AT EACH CYLINDER • HIGHER PRESSURE • FED OFF OF FUEL RAIL • MORE EFFICIENT OPERATION • MODES • MULTI-PORT • SEQUENTIAL

  9. PORT FUEL INJECTION

  10. CENTRAL POINT INJECTION • GM SYSTEM • INJECTOR LOCATED IN LOWER HALF OF INTAKE MANIFOLD • POPPET VALVES • HIGH PRESSURE 60 PSI

  11. CONTINUOUS INJECTION • SPRAYS ALL THE TIME • MIXTURE CONTROL UNIT • FUEL DISTRIBUTOR • CONTROL PRESSURE REGULATOR

  12. FUEL PRESSURE REGULATOR • Used on TBI systems • Provides constant fuel supply • Fuel pressure on one side • Fuel pressure opens regulator under a certain pressure. • Spring is calibrated

  13. INJECTION SYSTEM SERVICE

  14. SYSTEM CHECKS • ADEQUATE AIR SUPPLY • PRESSURIZED FUEL SUPPLY • ADEQUATE TRIGGER SIGNAL • NO VACUUM LEAKS • GOOD IGNITION SYSTEM • GOOD ENGINE MECHANICAL • GOOD FUEL QUALITY • PCM OPERATION

  15. FUEL DELIVERY • Fuel Pump noises • Does fuel pump run at all? • Fuel filter condition? • Connections to fuel pump

  16. COMPONENT CHECKS • AIR INDUCTION • AIR FLOW SENSORS • THROTTLE BODY • FUEL SYSTEM CHECKS • FUEL DELIVERY • INJECTOR CHECKS • INJECTOR CLEANING 6-61 LAB

  17. INERTIA SWITCH

  18. INJECTOR TESTS • ELECTRICAL OPERATION • VOLTAGE SIGNALS • SCOPE TESTING • MECHANICIAL OPERATION • PINTLE OPERATION • BALANCE TEST • FLOW

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