Fuel Supply

Safety Precautions


• Fuel system is under pressure! Before opening system, place rags around the connection area. Then release pressure by carefully loosening the connection.

• Vehicles with FSI engine: The engine section of the fuel system, after the high pressure pump, is under extremely high pressure! When working on engine or fuel injection system, pressure must be relieved to residual pressure before opening high pressure components.

Perform the following steps before beginning work on the fuel supply system:

• Disconnect the battery Ground (GND) cable with the ignition switched off.

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

When removing and installing components from full or partially full fuel tanks, observe the following:

• The fuel tank must 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.

• Before starting work, switch on the exhaust extraction system and place an extraction hose close to the installation opening of the 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 the skin! Wear fuel-resistant gloves!

To reduce the risk of personal injury and/or damage to the fuel injection and ignition system, always observe the following:

• Do not touch or disconnect ignition wires when engine is running or turning at starting RPM.

• Always switch ignition off before disconnecting or reconnecting wires for the injection and ignition system, including high voltage wiring and test leads.

• It is possible that the control module will recognize a malfunction and store a DTC during some tests. After completing all tests and repairs, DTC memory should therefore be checked and erased if necessary. Readiness code must be generated after DTC memory is erased => [ Readiness Code ] Readiness Code.

• Always switch ignition off before cleaning engine.