NANO

ENGINE 273 MPFI 195 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