Fuel Supply System Safety Precautions

WARNING: This page is about a different car, the 2015 Audi S7, 2015 Audi RS 7, 2014 Audi S7, 2014 Audi RS 7, and 2013 Audi S7. However, it is still accessible from the selected car via links, so may be relevant.

Note the Following When Working on the Fuel Supply:

WARNING:

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

Reduce the fuel pressure down to residual pressure before opening high pressure area of the fuel injection system. Procedure, refer to HIGH FUEL PRESSURE, REDUCING .
To reduce remaining residual pressure, place clean cloth around the connector and carefully loosen connector.

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 -G6- must be disconnected before opening the fuel system.
Disconnect the power supply by removing the fuse for the Fuel Pump Control Module -J538- /fuel delivery unit, refer to appropriate System Wiring Diagram or disconnect the battery.

To Prevent Personal Injury and Damage to the Injection and Ignition System, Observe the Following:

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.
Delete any DTC memory entries that occurred during testing or assembly see Vehicle Diagnostic Tester, Check DTC memory , and then Generate readiness code .

CAUTION:

Risk of damaging electronic components when disconnecting the battery.

Complete the steps for disconnecting the battery.
Disconnect the battery only when the ignition is turned off, refer to BATTERY, DISCONNECTING AND CONNECTING .