Releasing pressure in high-pressure area

Prior to opening the high-pressure area, e.g. when removing the high-pressure pump, fuel rail, injectors, a fuel line, or the fuel pressure sender - G247-, the fuel pressure in the highpressure area must be reduced to a residual pressure of approx. 6 bar. The appropriate procedure is described as follows.

• Connect ⇒ Vehicle diagnostic tester and perform Guided Function “Releasing fuel high-pressure”.
• Switch off ignition.

• Wrap a clean cloth around the connection and carefully open to release residual pressure of approx. 6 bar. Catch the escaping fuel.
• After completing work, read event memory of engine control unit and clear all event entries that may have been created as a result of pulling off the connector.