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ENGINE 273 MPFI
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ENGINE
GENERAL DESCRIPTION
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:
i. Fuel Pump with in built Pressure Regulator
ii. Fuel Level Sensor Assembly
iii. Multifunction Valve (Roll Over Valve)
Fuel System has main three lines, that is,
i. Fuel feed Line
ii. Fuel return Line
iii. Fuel vapour 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 fed under pressure to each injector.
The fuel pressure at the injector is always higher than
the intake manifold pressure. The fuel is injected 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 for tank
ventilation is “Closed” type. The system prevents fuel
vapours formed within the tank and entering to the
atmosphere. It also prevents the release of their load
of polluting light hydrocarbons (HC).
SYSTEM SCHEMATIC