Fuel System

Fuel System

Note the following when working on the fuel system:

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

• Reduce the fuel pressure down to residual pressure before opening the high pressure area of the fuel injection system.

• To reduce remaining residual pressure, place clean cloth around the connector and carefully loosen connector.

Risk of escaping fuel.

• To prevent the fuel pump from running when the driver door is opened, the fuel pump fuse must be removed for safety reasons before opening the fuel system if the battery is not disconnected or the fuel pump delivery unit electrical connector is not disconnected.

- Procedures before opening the high pressure fuel injection system.

To prevent personal injury and damage to the injection and ignition system, observe the following:

• Turn off the ignition before disconnecting and connecting the wiring for the injection and ignition system. This includes tester cables as well.

• Only clean engine with ignition turned off.

• If the connectors were disconnected and the engine was started, then malfunctions have been stored in the ECM Diagnostic Trouble Code (DTC) memory: Generate readiness code in Guided Functions vehicle diagnosis tester.

Carry out the following measures before starting work on the fuel supply:

Risk of explosion due to cell phones.

• Keep cell phones out of reach in the work space area.

Risk of destroying electrical components.

• Observe measures for disconnecting battery.

• Disconnect the battery.

• Open fuel filler flap and then close again.