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HIGH FUEL PRESSURE LINE
High Pressure Pump
Description
This pump generates high fuel pressure and is driven by timing chain (radial plunger principle). This pump pressurizes
the fuel to approx. 1600 bar and sends this high pressurized fuel to high pressure accumulator (common rail) via high
pressure line.
It is possible to extend the pumping phase in order to considerably reduce drive torque, vibration and noise since the pump no
longer determines the injection period. The differences from conventional rotary pumps lies in the fact that it is no longer the
hydraulic head rotor which turns inside the cam, but the cam which turns around the hydraulic head. Thus, any problems of
dynamic pressure tightness are eliminated because the high pressure is generated in the fixed part of the pump.
Fuel supply
Specifications
• Maximum operating pressure: 1600
• Max. Overpressure: 2100 bar
• Maximum sealing pressure: when using a plug instead of PRV, no leaks around pump outlet port (when applying
2500 bar of constant pressure)
• Operating temperature: Continuously operating within temperature range of -30°C ~ 120°C in engine compartment
• Inflowing fuel temperature: The maximum inflowing fuel temperature is 85°C (continuously able to operate)
• Pump inlet pressure: Relative pressure Min. - 0.48 bar (to end of filter's lifetime)
• Driving torque: 15 Nm / 1600 bar
• Gear ratio (engine: pump): 0.625
• Lubrication:
- Inside lubrication (rear bearing): Fuel
- Outside lubrication (front bearing): Engine oil
FUEL SYSTEM
DI ENG SM - 2004.4
Fuel
discharge
150 bar
±
1. IMV (Inlet Metering Valve)
2. Hydraulic Head
3. Plunger
4. Drive shaft and cam ring
5. Housing
6. Roller and shoe
7. Transfer pump
8. Fuel temperature sensor
9. High fuel pressure - OUT
10. Pressure regulator
CHANGED BY
EFFECTIVE DATE
AFFECTED VIN
DI07-17
Y220_07021
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