Fuel Rail, High Pressure Lines, Fuel Injectors Overview

WARNING: This page is about a different car, the 2015 Audi Q7, 2014 Audi Q7, and 2013 Audi Q7. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION:

Danger of malfunction caused by dirt.

Note, refer to FUEL SYSTEM SAFETY PRECAUTIONS .

Fig 1: Exploded View Of Fuel Injectors

Courtesy of AUDI OF AMERICA, LLC

Guide Pin
- For the tension clamp
- Various tightening specifications:
  - 2.5 Nm on camshaft bearing
  - 9 Nm on cylinder head
Tensioning Clamp
- Mark the part allocations for reinstallation and follow them when installing
- Replace the tension bracket when replacing a fuel injector
Bolt
- Replace
- First tightening 8 Nm
- Second tightening 90 degrees
High Pressure Line
- 25 Nm
- From high pressure pump to fuel rail
- Do not change the shape of the line
- Check for damage before installing
- Installing, refer to HIGH PRESSURE LINES, INSTALLING
- Coat the union nut threads with clean engine oil
Clamp
- For high pressure line
Bolt
- 9 Nm
Clamp
- For high pressure line
Bolt
- 9 Nm
High Pressure Line
- 25 Nm
- From the opposite fuel rail
- Do not change the shape of the line
- Check for damage before installing
- Installing, refer to HIGH PRESSURE LINES, INSTALLING
- Coat the union nut threads with clean engine oil
Fuel Rail
Fuel Return Hose
- To fuel tank
Fuel Return Hose
- From fuel injectors
- Do not disassemble
- After replacing the engine, allow engine to idle for 2 minutes to bleed the fuel system.
- Then, check the fuel supply hoses for leaks
Hose Connection Ring
Banjo Bolt
- 25 Nm
Seals
- Replace
Fuel Pressure Regulator Valve -N276-
- With biting edge for sealing
- Cannot be used again
- Perform an adaptation after replacing the high pressure pump and / or the Fuel Pressure Regulator Valve -N276-. Use a Vehicle Diagnostic Tester to do this.
- Removing and installing, refer to Fuel Pressure Regulator Valve -N276-
- Tightening specification, refer to Figure
Bolt
- 22 Nm
High Pressure Line
- 25 Nm
- From fuel rail to fuel injector
- Do not change the shape of the line
- Mark the part allocations for reinstallation and follow them when installing
- Check for damage before installing
- Installing, refer to HIGH PRESSURE LINES, INSTALLING
- Coat the union nut threads with clean engine oil
Fuel Return Hose
- From fuel injectors
- Do not disassemble
- After replacing the engine, allow engine to idle for 2 minutes to bleed the fuel system.
- Then, check the fuel supply hoses for leaks
O-ring
- Replace
Injector
- Mark the part allocations for reinstallation and follow them when installing
- Removing and installing, refer to FUEL INJECTORS
O-ring
- Replace
Copper Sealing Ring
- Replace