NANO

200 ENGINE 273 MPFI PUMP WITH IN BUILT PRESSURE REGULATOR : Function: It’s a positive displacement pump assembly driven by motor to provide continuous flow of fuel to the high pressure fuel system from fuel tank. This pump is inbuilt with pressure regulator. The pressure regulator main- tains the pressure in fuel line. A return line is provided after fuel filter so that incase if pressure tends to rise, excess fuel returns back to fuel tank. This ensures the constant operating pressure of 3.5 bar in the fuel rail. The fuel pump consists of check valve to maintain pressure in the fuel feed line even when the fuel pump is switched OFF. Fuel Level Sensor Assembly Function: To give inputs to the fuel level unit on instrument clus- ter which indicates the fuel level. Multifunction Valve (Rollover valve) It is mounted on the same flange as of electric fuel pump. Function: Rollover valve has to perform following two important functions i. Rollover valve closes the evaporative line in case of rollover. ii. Acts as a vent in the evaporative control system. FUEL FILTER : Location: The fuel filter is located under the body near the fuel tank along with the pipe carrying the fuel to fuel rail. Function: It is made up of an outer case and an integral filter element with high filtering capacity. It filters the fuel being delivered under pressure by the fuel pump. This is essential for ensuring fuel injection operation since the injector is extremely sensitive to foreign particles in the supply circuit. Since it cannot be disassembled, it must be replaced as an assembly at the recom- mended intervals. Fuel filter is not repairable. Fuel Hoses and Lines The delivery and return lines are made of nylon pipes. Quick fix connectors are used at joints of inlet and outlet pipe of fuel filter. The vapour lines are made of rubber hoses and pipes with clamps at joints