Schematic Overview - Fuel System
WARNING: This page is about a different car, the 2016 Audi A6 Quattro. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION:
Danger of malfunction caused by dirt.
- Observe, refer to FUEL SYSTEM SAFETY PRECAUTIONS .
Follow the points below to avoid running the high pressure fuel pump dry (very low tolerances) and to start the engine quickly after replacing the components:
- If fuel system components between the fuel tank and high pressure fuel pump were removed or replaced, the fuel system must be bled, refer to FUEL SYSTEM, FILLING/BLEEDING .
- It is necessary to bleed the fuel system before starting the engine for the first time if the fuel pump, the fuel line (between the fuel tank and the high pressure fuel pump) or the fuel filter were removed.
- If the high pressure fuel pump was removed or replaced, then bleed the fuel system before starting the engine for the first time. Filling the fuel for the first time, refer to FUEL TANK, FILLING WITH FUEL AFTER INSTALLING HIGH PRESSURE PUMP .
NOTE:
If these instructions are not followed, the high pressure pump will be damaged during the first filling.
- Fuel Metering Valve -N290-
- Do not open
- High Pressure Pump
- Overview, refer to OVERVIEW - HIGH PRESSURE PUMP .
- Fuel Rail
- For cylinder bank 1 (right)
- Fuel Pressure Regulator Valve -N276-
- Cannot be used again
- Removing and installing, refer to Fuel Pressure Regulator Valve -N276-, REMOVING AND INSTALLING .
- Tightening specification, refer to appropriate service information.
- Fuel Pressure Sensor -G247-
- Tightening specification, refer to appropriate service information.
- Removing and installing, refer to Fuel Pressure Sensor -G247-, REMOVING AND INSTALLING .
- Fuel Rail
- For cylinder bank 2 (left)
- Injector
- Removing and installing, refer to FUEL INJECTORS, REMOVING AND INSTALLING
- Fuel Supply Hose
- Do not disassemble
- Replace completely along with the restrictor
- Restrictor
- There is remaining pressure in the fuel supply hoses
- Not able to be replaced separately; replace the fuel supply hoses if they are faulty
- Transfer Fuel Pump -G6-
- Fuel Filter