Fuel System Safety Precautions

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Note the Following When Working On the Fuel System:

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.
To reduce the remaining residual pressure, lay a clean cloth around the connection point and carefully loosen the connection point.

-- Procedures before opening high pressure fuel injection system. Refer to HIGH FUEL PRESSURE, REDUCING .

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 Diagnostic Trouble Code (DTC) memory entries that occurred during testing or assembly Vehicle Diagnostic Tester, Check DTC Memory , and then Generate Readiness Code .

CAUTION:

Risk of destroying electronic components when disconnecting the battery.

Observe the steps for disconnecting the battery.
Always turn off the ignition before disconnecting the battery.

-- Disconnect the battery. Refer to BATTERY, DISCONNECTING AND CONNECTING .

Carry Out the Following Measures Before Starting Work on the Fuel Supply

WARNING:

Danger of explosion due to cell phones.

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

CAUTION:

Danger of causing damage to electronic components.

Observe the steps for disconnecting the battery.

Disconnect the battery. Refer to BATTERY, DISCONNECTING AND CONNECTING .
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, VEHICLES WITH FWD AND AWD .
Before starting work, switch on 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 the motor is not in air flow) with a displacement greater than 15 m³ /h can be used.
Do not let fuel come in contact with skin. Wear fuel-resistant gloves.

Note the Following When Removing and Installing the Fuel Tank

Fuel tank must be empty. Empty the fuel tank, if necessary. Refer to FUEL TANK, DRAINING, VEHICLES WITH FWD AND AWD .