78 4 DLT ENGINE Fig. 161 Principles of DPC pump operation & Hydraulic Circuit with Boost Control The Fuel system on Tata Safari consists of a fuel tank, fuel filters, a fuel injection pump and the injectors. The Fuel is drawn into the fuel injection pump by the transfer pump through filter assembly. A hand primer fitted between the tank and the filter facilitate in filling and venting operations. A return line from the pump and the injectors is connected to the tank thus forming a closed loop system. The transfer pump sucks the fuel from the tank, through filter assembly and increase the feed pressure and regulates it. The transferred pressure fuel is metered by a metering valve and passes through electrical shut-off valve. The metered fuel passes through the various drillings of the Head & Rotor between the pumping plungers in the rotor. The pumping plungers when depressed by the action of the opposed cam lobes, rise the pressure to much greater level and the fuel at high pressure flows to the injectors. FUEL INJECTION EQUIPMENT SCHEMATIC LAYOUT AND FUNCTION Injector Hand Priming Pump Secondary Fuel Filter FIP HP lines Tank Cap With Breather Fuel return line Fuel Tank Fuel Supply line Primary Fuel Filter
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