Schematic Overview - Fuel System
WARNING: This page is about a different car, the 2016 Audi A8 Quattro and 2015 Audi A8 Quattro. However, it is still accessible from the selected car via links, so may be relevant.
- Fuel Metering Valve -N290-
- Do not open
- High Pressure Pump
- Overview. Refer to OVERVIEW - HIGH PRESSURE PUMP .
- High Pressure Reservoir (Rail)
- For cylinder bank 1 (right)
- Fuel Pressure Regulator Valve -N276-
- Tightening specification. Refer to Fig 2.
- With biting edge for sealing
- Cannot be used again
- After replacing, perform an adaptation using the Vehicle Diagnostic Tester, Guided Functions
- Removing and installing. Refer to Fuel Pressure Regulator Valve -N276-, REMOVING AND INSTALLING .
- Fuel Pressure Sensor -G247-
- Tightening specification. Refer to Fig 3.
- With biting edge for sealing
- Cannot be used again
- Removing and installing. Refer to Fuel Pressure Sensor -G247-, REMOVING AND INSTALLING .
- High Pressure Reservoir (Rail)
- For cylinder bank 2 (left)
- Injector
- Removing and installing. Refer to FUEL INJECTORS, REMOVING AND INSTALLING .
- Fuel Supply Hose
- Do not disassemble
- Replace only complete with change-over roller
- Restrictor
- There is very little remaining pressure in the fuel supply hoses
- Cannot be replaced separately; replace the complete fuel supply hoses if they are faulty
- Check the restrictor. Refer to FUEL RETURN LINE RESTRICTOR, CHECKING
- Transfer Fuel Pump -G6-
- Fuel Filter
Fuel Pressure Regulator Valve N276 - Tightening Specification
-- Align the Fuel Pressure Regulator Valve -N276- so that connecting the connector -arrow- does not cause the electrical wiring to be placed under tension.
-- Counterhold the housing hex bolt to tighten union nut on regulator valve in 4 stages as follows:
| Step | Tightening Specification |
|---|---|
| 1. | Install all the way in by hand. |
| 2. | 60 Nm |
| 3. | Turn back 90° |
| 4. | 85 Nm |
Fuel Pressure Sensor G247 - Tightening Specification
-- Tighten the Fuel Pressure Sensor -G247- in four steps as follows:
NOTE:
Do not use an open-end wrench for opening or tightening.
Special tools and workshop equipment required
- Socket - 27mm: T40218
- Torque wrench
| Step | Tightening Specification |
|---|---|
| 1. | Install all the way in by hand. |
| 2. | 60 Nm |
| 3. | Turn back 180° |
| 4. | 85 Nm |