1.
Fuel feed system for
petrol engine

2.
Fuel feed system for petrol engine
 It consist of following :
 petrol tank,
 fuel lines,
 fuel pump,
 fuel filter,
 air cleaner,
 carburettor,
 inlet manifold and
 pipelines

3.
Types of system for fuel supply
 Gravity system
 Pressure system
 Vacuum system
 Pump system
 Fuel injection system
 In this first four system used carburettor and in last carburettor has been
dispensed with altogether.

4.
Types of system for fuel supply
 Gravity feed system
 In this system the petrol is supply to the engine by gravitational force.
 In this system the level of fuel is high than engine, due to the level tank the petrol will
automatically supply by gravitational force .
 The cock is very important in this system because there is a possibility of leakage the cock is
having three position that is on, of and reserve.
 This system used in two wheeler and three wheeler.
 Pressure feed system
 In this system the fuel tanks is fitted at lower level of engine so that petrol cannot flow
automatically hence fuel pump is used.
 The fuel pumps suck the fuel from tank and give the pressure to petrol and supply it engine.

5.
Types of system for fuel supply
 Vacuum system
 This system is based on simple fact that engine suction can be used for sucking fuel from main
tank to auxiliary fuel tank where it flows by gravity.
 Pump system
 In this system feed pump supplied the petrol from tank to carburettor.
 Two types of pumps are used Mechanical and Electrical.
 Fuel injection system
 In this system carburettor is replaced by fuel injection pump.
 Fuel is in atomised form by means of nozzle and then provided to air stream.
 Separate fuel injector used for each cylinder.
 This is most accurate fuel supply system.

6.
Fuel Pumps
A C Mechanical Pump
ElectricalPump

7.
A C (Albert Champion) Mechanical Pump

8.
A C (Albert Champion) Mechanical Pump
 Most mechanical fuel pumps are diaphragm pumps, Diaphragm pumps contain a
pump chamber whose volume is increased or decreased by flexible diaphragm.
 A check valve is located at both the inlet and outlet ports of the pump chamber to
force the fuel to flow in one direction only.
 These pumps are typically bolted onto the engine block or head, and the engine's
camshaft has an extra eccentric lobe that operates a lever on the pump.
 The return motion of the diaphragm to top dead center is accomplished by a
diaphragm spring, during which the fuel in the pump chamber is squeezed
through the outlet port and into the carburetor.

9.
S.U. (Santokh Uppal) Electric Fuel Pump
 In many modern cars the fuel pump is usually electric
and located inside the fuel tank. The pump creates
positive pressure in the fuel lines, pushing the gasoline
to the engine.
 The ignition switch does not carry the power to the fuel
pump; instead, it activates a relay which will handle the
higher current load.

10.
Fuel Filters

11.
Fuel Filters
 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.
 If these substances are not removed before the fuel enters the system, they will
cause rapid wear and failure of the fuel pump and injectors, due to
the abrasive action of the particles.
 Fuel filters also improve performance, as the fewer contaminants present in the
fuel, the more efficiently it can be burnt.
 Some filters, especially found on diesel engines, are of a bowl-like design which
collect water in the bottom (as water is more dense than diesel).

12.
Air Filters

13.
Air Filters
 There are many things in the air, however, that don't burn cleanly or at all.
 If tiny pieces of dirt, road salt, pollen or other contaminants get into your car's
air intake, they can damage pistons, clog valves and generally shorten the life of
your car.
 The air filter stops these contaminants from getting in in the first place.
 Air filters on most cars are rectangular, pleated screens called paper filters.

14.
Thank You