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.

- Procedures before opening high pressure fuel injection system.

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

• The ignition must be turned off before connecting or disconnecting injection and ignition system wiring or tester cables.

• Wash the engine only when the ignition is turned off.

• If the electrical connectors were disconnected and the engine was started, then malfunctions have been stored in the Engine Control Modules (ECM). Generate Readiness Code in Guided Functions vehicle diagnosis tester.

Danger of causing damage to other electronic components when disconnecting the battery.

• Complete the steps for disconnecting the battery.

• Always turn off the ignition before disconnecting the battery.

- Disconnect the battery.

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

Danger of explosion due to cell phones.

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

Danger of causing damage to electronic components.

• Complete the steps for disconnecting the battery.

• Disconnect the battery.

• Open the fuel filler flap briefly and then close it again.

Note the following when removing and installing components from a filled or partially filled fuel tank:

• The fuel tank may only be partially full. How much fuel can remain in the fuel tank may be read in the respective work description. Empty the fuel tank, if necessary, refer to => [ Fuel Tank, Draining ] Procedures.

• Before starting work, turn on the exhaust extraction system and place an extraction hose close to the installation opening of fuel tank to extract escaping fuel fumes. If no exhaust extraction system is available, a radial fan (as long as motor is not in air flow) with a displacement greater than 15 m3/h can be used.

• Prevent fuel from contacting skin! Wear fuel-resistant gloves!

Note the following when removing and installing the fuel tank:

• Fuel tank must be empty for weight reasons. Empty the fuel tank, if necessary, refer to => [ Fuel Tank, Draining ] Procedures.