audi Workshop Repair Guides

Audi Workshop Service and Repair Manuals

Rules for cleanliness > < General repair instructions
Fuel supply system - Petrol engines
Notes for working on fuel supply system
Safety precautions when working on the fuel supply system
Warning
Fuel system is under pressure. Before opening the system place a cloth around the connection. Then release pressure by carefully loosening the connection.

Perform the following steps before starting to work on the fuel supply system:

  • ◆ With ignition switched off, disconnect earth strap from battery.
  • ◆ Open fuel filler cap briefly, then close it again.

When removing and installing the fuel gauge sender or fuel delivery unit from a full or partly full fuel tank, note the following:

  • ◆ The fuel tank must not be more than3/4full.
  • ◆ If necessary, drain the tank according to instructions:
    .
  • ◆ Before commencing work, switch on exhaust extraction system and place an extraction hose close to the sender opening in 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 skin contact with fuel. Wear fuel-resistant gloves.

Drain the fuel tank before removal from the vehicle in order to reduce weight.

  • ◆ If necessary, drain the tank according to instructions:
    => Page 20-13.

Rules for cleanliness > < General repair instructions