Fuel feed system in petrol engine ppt

class conducted for iti student

1. WELCOME TO ALL Fuel feed system in petrol enigine Presentation by G. JAGADEESKUMAR JTO/MMV GOVT ITI DHARMAPURI

2. The main purpose of the fuel feed system is to control the fuel supply to the engine. To supply the fuel from the fuel tank to the engine cylinders . FUEL FEED SYSTEM IN ENGINE

3. Gravity fuel Feed system AIR Pressurized fuel Feed system Vacuum fuel Feed system Pump fuel Feed system Fuel injection fuel Feed system TYPES OF FUEL FEED SYSTEM IN PETROL ENGINE

4. The ‘gravity system’ is confined to smaller vehicles such as entry-level two-wheelers, bikes, and quads only. In this design, the engineers mount the fuel tank at the highest position. It feeds the fuel into the  carburetor  float chamber by gravity. This system has a very simple design and hence, cheaper to produce and maintain. However, the disadvantage is that you need to place the fuel tank over the carburetor for this system to work correctly. GRAVITY TYPE FUEL FEED SYSTEM

5. In this  system , an airtight  fuel  tank is used and is placed under the seat or near the engine. the hand operated a  pump  or mechanically operated  pump  supplies the high- pressure air  to the  fuel  tank for  supply  the  fuel  to the carburetor. AIR PRESSURE TYPE FUEL FEED SYSTEM

6. VACUUME FUEL FEED SYSTEM

7. This system uses  engine  suction pressure to suck the fuel from the main tank to an auxiliary tank The fuel flows to the  carburetor  float chamber by gravity. This system is now obsolete. VACCUME FUEL FEED SYSTEM

8. Most present-day cars use this system. This system uses a steel pipe to supply the  petrol  to the fuel pump which then pumps it into the  carburetor  float chamber thru’ flexible pipe. If it is a mechanical fuel pump, then it gets the drive from the engine camshaft. Hence, it is attached to the engine. On the other hand, electrically operated fuel pumps can be placed anywhere. So, manufacturers place it inside the fuel tank to reduce the chance of vapor-lock. PUMP PRESSURE FUEL FEED SYSTEM

9. PUMP PRESSUE FUEL FEED SYSTEM

10. Modern/present-day vehicles use  petrol injection system  which replaced the carburetor. The  injector  nozzle atomizes the fuel and forces it into the air stream. Newer generation engines use separate injector for each cylinder. The  air-fuel  mixture for different load and speed conditions is controlled either mechanically or electronically. Hence, this makes the fuel system more accurate. For more information, read about the  EFI, MPFI & GDi . FUEL INJECTION SYSTEM IN PETROL (EFI/MPFI/GDI / ENGINE) Modern/present-day vehicles use  petrol injection system  which replaced the carburetor. The  injector  nozzle atomizes the fuel and forces it into the air stream. Newer generation engines use separate injector for each cylinder. The  air-fuel  mixture for different load and speed conditions is controlled either mechanically or electronically. Hence, this makes the fuel system more accurate. For more information, read about the  EFI, MPFI & GDi .

11. Fuel tank Filters Fuel pump Fuel lines Carburetor  or  injectors Engine-management system Fuel gauge COMPONENTS USED IN PUMP /INJECTION TYPE FUEL FEED SYSTEM

12. The fuel tank holds the fuel for the engine its imade up of stee or aluminium or synthetic rubber components and fibre reinforced plastics which are flame resistant The tank are coated with lead-tin alloy to protect the tank from the corrosion effect FUEL TANK

13. FUEL FILTER Filter made up of paper or ceramic element Fuel filter is placed between petrol feed pump and carburettor A  fuel filter  is a filter in  the fuel  line that screens out dirt and rust particles from  the fuel , normally made into cartridges containing a filter paper

14. Fuel feed pump (mechanical)

15. Fuel feed pump

16. Fuel feed pump (electrical )

17. A  fuel line  is a  hose  used to bring  fuel  from one point in a vehicle to another or from a storage tank to a vehicle. It is commonly  made  of reinforced rubber to prevent splitting and kinking. Fuel lines hose

18. The main  function  of  carburetors  to mix air and gasoline and provides a high combustion mixture. It controls the engine speed. It also regulates the air-fuel ratio. Increase or decrease the amount of mixture according to the engine speed and load changing CARBURETTOR

19. CARBURETTOR

20. TYPES OF CARBURETTOR

21. The function of a carburetor is to vaporize the petrol (gasoline) by means of engine suction and to supply the required air and fuel (petrol) mixture to the engine cylinder. During the suction stroke, air flows from atmosphere into the cylinder. As the air passes through the venturi , velocity of air increases and its pressure falls below the atmosphere. The pressure at the nozzle tip is also below the atmospheric pressure. The pressure on the fuel surface of the fuel tank is atmospheric. . Simple carburettor

22. Due to which a pressure difference is created, which causes the flow of fuel through the fuel jet into the air stream. As the fuel and air pass ahead of the venturi , the fuel gets vaporized and required uniform mixture is supplied to the engine Note Automization Evaporation Carburation (homogeneous mixture) Carburettor popping due to back fire of lean mixing SIMPLE CARBURETTOR

23. Air fuel mixing ratio

24. Float circuit Starting circuit Idling circuit and slow speed circuit Main/high speed circuit Acceleration pump circuit Econostat circuit Solex carburettor

25. Advantage of solex carburettor Separate circuit for different, scanario like starting circuit, idling,acceleration .. Esee of starting the Bi starer helps to cold starting of the vehicle Throttle responds increase Solex carburettor has an additional pump circuit for suddern acceleration requirement Easily change flow rate of air fuel ratio.

26. Any questions or doubts ?

27. Thanks for all