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FUEL SYSTEM
1
1.1 INTRODUCTION
The main components of the fuel system are fuel
tank, tank pressure valve, fuel filter, fuel module,
carbon canister, fuel lines & canister purge valve.
Fuel module has three subassemblies: -
1. Fuel Pump with in built Pressure Regulator
2. Fuel Level Sensor Assembly
3. Roll Over Valve
Fuel System has three lines that are:
1) Fuel Feed Line
2) Fuel Return Line
3) Fuel Vapor Line
The fuel in the tank is pumped up by the electric fuel
pump inbuilt on the fuel module, filtered by the fuel
filter and feed with specified pressure to engine rail.
The fuel pressure at the injector is always higher
than the intake manifold pressure. The fuel is inject-
ed into the intake port of the cylinder head when the
injector opens according to the injection signal from
ECU (Engine Control Unit).
The evaporative emission control system stores
vapour formed in the fuel tank in canister and ECU
operated purge valve allows purging of the stored
vapours in intake manifold system as and when re-
quired based on EMS.
1.2 PRECAUTIONS
Precautions to be followed while performing repair
or maintenance of fuel system:
1) Fuel is explosive. When working on fuel system
make sure to supply adequate ventilation to the
work area. Do not smoke and keep sparks and
open flames away from workspace.
2) Disconnect negative cable terminal of battery.
3) Release the fuel pressure from the fuel system
to reduce the possibility of injury or fire.
4) Before repairing fuel tank assembly, clean it
thoroughly to remove traces of fuel.
5) Always wear safety glasses and gloves.
1.3 SPECIFICATIONS
Pump Pressure
Fuel pump pressure
(with inbuilt pressure
regulator)
3.5 bar
Canister
Canister capacity
25 BWC
Filter
Fuel filter type
In-line
Tank
Fuel tank capacity
24 Litres
Fuel
Unleaded regular grade petrol confirming to IS
2796/DIN E228 (or equivalent) and octane rating
not less than 88 RON for BS-II , 91 RON for
BS_III and 95 RON for BSIV is recommended as
fuel (RON stands for Research Octane Number).