Working On Fuel System
WARNING: This page is about a different car, the 2015 Audi Q7, 2014 Audi Q7, 2013 Audi Q7, 2012 Audi Q7, and 2011 Audi Q7. However, it is still accessible from the selected car via links, so may be relevant.
Note the following When Working on the Fuel System:
WARNING:
- The injection system is separated into a high-pressure section (maximum approximately 120 bar (1740 psi)) and a low-pressure section (approximately 6 bar (87 psi)).
- Before opening the high pressure area, the fuel pressure must be reduced in the high pressure area. Refer to RELEASING PRESSURE IN HIGH PRESSURE AREA .
WARNING:
There is a risk of injury because the fuel is under pressure.
- Place clean rags around the connection before opening the system. Then release pressure by carefully loosening the connection.
- Wear safety gloves.
- Wear protective eyewear.
Very hot fuel can cause burns.
- The temperature of the fuel lines and may reach 100 °C (212 °F) after stopping the engine. Let the fuel cool down before opening any line connections otherwise there is a danger of scalding.
- Wear safety gloves.
- Wear protective eyewear.
WARNING:
Danger due to leaking fuel.
- Because the Transfer Fuel Pump -G6- runs briefly when the battery is connected and the driver's door is opened, the voltage supply to the Transfer Fuel Pump -G6- must be disconnected before opening the fuel system.
CAUTION:
Risk of destroying electronic components when disconnecting the battery.
- Make sure to complete the steps for disconnecting the battery. Refer to BATTERY, DISCONNECTING AND CONNECTING .
-- Procedures before opening high pressure fuel injection system. Refer to SAFETY PRECAUTIONS AND CLEAN WORKING CONDITIONS .
To Prevent Personal Injury and Damage to the Injection and Ignition System, Observe the Following:
- Individuals with a pacemaker must not stay in the danger area of high voltage systems, for example ignition systems, xenon light.
- Fuel lines must not be opened when engine is running.
- The ignition must be switched off before connecting or disconnecting injection and ignition system wiring or tester cables.
- Wash the engine only when the ignition is turned off.
-- Disconnect the battery. Refer to BATTERY, DISCONNECTING AND CONNECTING .
Delete any DTC memory entries that occurred during testing or assembly using the Vehicle Diagnostic Tester, in Guided Functions , Check DTC memory , and then Generate readiness code .