High Pressure Pump Overview

Fig 1: High Pressure Pump Overview

Courtesy of AUDI OF AMERICA, LLC

1. Fuel Metering Valve -N290-
   • Cannot be separated from the high pressure pump
2. Low Fuel Pressure Sensor -G410-
   • 15 Nm
3. Seal
   • Replace
4. Bolt
   • 20 Nm
5. High Pressure Pump
   • With fuel metering valve -N290- (cannot be separated)
   • Tighten fuel line connecting pieces before installing fuel lines
   • Removing and installing, refer to HIGH PRESSURE PUMP 
   • Do not disassemble
6. Threaded Support
   • 27 Nm
7. Hose Clamp
   • Replace; must be appropriate for the model type .
8. Fuel Supply Hose
   • Low pressure side
9. High Pressure Fuel Line
   WARNING:

   There is a risk of injury because the fuel is under very high pressure.

   • Before opening high pressure components of the fuel injection system, pressure must be relieved to residual pressure.
   • Reduce fuel pressure in the high pressure area, refer to BEFORE OPENING HIGH PRESSURE FUEL INJECTION SYSTEM .
   • Counter hold to loosen and tighten union nut on high pressure pump connecting pieces
   • Tighten connecting pieces on high pressure pump before installing
   • Installing, refer to Fig 3
10. Gasket
    • Replace
11. Bolt
    • 9 Nm
12. Camshaft Position (CMP) Sensor -G40-
13. Bolt
    • 9 Nm
14. O-ring
    • Replace
    • Lubricate O-rings with clean engine oil before installing
15. Housing
16. Roller Tappet
    • Lubricate O-rings with clean engine oil before installing
17. O-ring
    • Replace
    • Lubricate O-rings with clean engine oil before installing

Fig 2: Identifying Nuts -Arrows- And Protective Plate -1-

Courtesy of AUDI OF AMERICA, LLC

-- Tighten bolts -arrows- on the protective plate -1-.

• Tightening Specifications: 9 Nm

Fig 3: Fastening High-Pressure Line (14 mm) At High Pressure Pump Use Torque Wrench VAS1331 With Ratchet VAS1331/1 And Socket 14 mm 3150

Courtesy of AUDI OF AMERICA, LLC

-- First tighten the high pressure line union nut by hand.

-- Make sure the high pressure line does not have any tension.

-- To tighten the high pressure line on the high pressure pump, use the torque wrench 5-50 Nm VAS1331 with the ratchet VAS1331/1 and socket 14 mm 3150.

• Tightening Specifications High pressure line union nut: 25 Nm