The document summarizes the fuel supply systems of SI (spark ignition) and CI (compression ignition) engines. For SI engines, the key components are the fuel tank, fuel pump, fuel filter, carburetor and inlet manifold. For CI engines, the key components are the fuel tank, fuel transfer pump, fuel filter, injection pump and injection nozzles. The fuel transfer pump moves fuel through the fuel filter to the injection pump. The injection pump then supplies precise, high-pressure fuel to the injection nozzles for injection into each cylinder at the correct time.

1. SUBJECT : INTERNALCOMBUTION
ENGINES (2161902 )
Active Learning assignment on:-
“Fuel Supply system SI and CI Engines”
Prepared by:-Savsani Happy (150123119045)
3/21/2017 1ICE (fuel supply system )

2. SI Engine Fuel Supply System
I. Fuel Storage Tank and Fuel pipes
II. Fuel Pump
III. Fuel Filter
IV. Carburetor
V. Inlet manifold
VI. Inlet Valve
This system in petrol engine mainly consists of below parts
3/21/2017 2ICE (fuel supply system )

3. Fuel storage tank :-
•The fuel tank made be made from pressed steel and coated inside to
prevent corrosion, or A synthetic rubber compound or flame resistant
plastic.
•Inside the fuel tank is normally located the fuel gauge sender unit and
electrically driven fuel pump with A primary filter in A combined
module. Internal fuel tank baffles are used to prevent fuel surge.
Fuel pipes:-
•These can be made from steel or plastic and are secured by clips at
several points along the underside of the vehicle.
•To allow for engine movement and vibration, rubber hoses connect the
pipes to the engine. Later fuel pipes use special connectors which
require special tools to disconnect the pipes.
3/21/2017 3ICE (fuel supply system )

4.  Fuel Pump:-
•A diaphragm type fuel pump is used in petrol engines as there is no
need of extra high pressure of fuel. This fuel pump is extensively used
to pump the fuel from fuel tank to the carburetor in the automotive
engines. A flexible diaphragm is moved down against the force of the
diaphragm spring by the diaphragm lever and the operating arm which
is actuated by the camshaft eccentrically.
•The pressure falls in the pump chamber and so the fuel from the fuel
tank flows through the fuel inlet valve. Fuel inlet valve closes at the
return stroke as diaphragm spring forces the diaphragm upwards, same
time fuel outlet valve opens and thus the fuel starts flowing from the
pump to the carburetor.
3/21/2017 4ICE (fuel supply system )

5. Fuel Filter:-
•To get rid of unwanted dirt, filters are used. A filter used to clean the air
is known as air filter, to clean fuel, is known as fuel filter, to clean
lubricating oil, is known as oil filter. In filters, paper elements, cloth
elements, felt elements and the combination of felt and cloth elements
are used.
Carburetor
•This is the device which mixes the fuel with air and supplies this
mixture to induction manifold of the petrol engine. The carburetor
controls the required quantity of fuel and breaks up into minute
globules for being mixed with the correct quantity of air.
3/21/2017 5ICE (fuel supply system )

6. •This system in diesel engine mainly consists of below parts,
I. Fuel Storage Tank and Fuel pipes
II. Fuel Transfer Pump
III. Fuel Filter
IV. Injection Pump
V. Injection Nozzles
CI Engine Fuel Supply System:-
Diesel fuel system the primary job of
the diesel fuel system is to inject precise amount of atomized and
pressurized fuel in to each engine cylinder at the precise time. The major
parts of the diesel system are the fuel tank, fuel transfer pump
,fuel filters, injection pump, and injection nozzles
3/21/2017 6ICE (fuel supply system )

7. Fuel Transfer Pump:-
The fuel transfer pump is normally used on modern high-speed diesel
engines. It can be driven by either engine or battery voltage.
The fuel transfer pump can be located on the outside of the fuel tank
in the supply line, submerged within the fuel tank, or mounted on the
backside of the injection pump.
The fuel pump pushes or draws the fuel through the filters where the
fuel is cleaned.
Injection Pump
Several types of injection pumps are used on diesel engines. Each
has its own unique operating principles. The primary function of the
injection pump is to supply high-pressure fuel for injection.
3/21/2017 7ICE (fuel supply system )

8. Injection Nozzles:-
•A wide variety of injector nozzles are in use today. All are designed to
perform the same basic function which is to spray the fuel in atomized form
into the combustion chamber of each cylinder.
3/21/2017 8ICE (fuel supply system )

9. 3/21/2017 9ICE (fuel supply system )