ENGINE 53 1 2 3 4 5 6 1 Pump inlet 2 Venturi 3 Fuel temp. Sensor (FTS) 4 Inlet metering valve (IMV) 5 Pump outlet 6 Drive to HP pump Rear mtng. bracket Front mtng. bracket High Pressure Pump DFP 1.2 (4 plunger) with double driveshaft seal for gear drive. Technical Description ● Gear drive – Clockwise rotation ● Double driveshaft seal ● Drive ratio : 0.5 ● Mounting flange with three M8 thread holes ● Centering diameter : 68 mm ● Hydraulic connection : no inlet screw nor banjo ● Mechanical connection: rear bracket. ● Fuel temperature sensor and venturi ● Inlet metering valve (IMV) ● Integrated Transfer Pressure Pump ● Pressure limiter ● Pump: 4 Plunger Pump (Multi Lobe Cams) ● Up to 1600 bar operating pressure ● Venturi in pump return Lift pump (Transfer pump) sucks fuel from tank and provides intermediate pressure to HP chambers. IMV ● Controls fuel flow into HP chamber in order to control rail pressure ● NO high pressure fuel is spilled from system=good energy management Venturi ● Generates a depression in the fuel injector backleak circuit ● The depression in the injector control valve chamber improves shot to shot Temperature sensor ● Measures fuel temperature in Transfer pressure circuit ● This information is used to modify rail pressure control terms at extreme temperatures Fitment Pump fitted with a pump mounting bracket on TGH. Rear support for arresting vibrations in pump. No injection timing adjustment to be done in the pump. Injection timing is programmed in the ECU. Precaution Ports to be plugged with caps if HP pipes or backleak pipes are removed. It has to be replaced in case of serious damage caused due to dust entry. Following is the removal and fitment procedure.
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