42
Fuel system
Fuel tanks for vehicles with front-wheel drive
and quattro power train
Different fuel tanks are used in the front-wheel
drive and quattro versions of the Audi TT.
Both fuel tanks are made of plastic and have a
capacity of 55 ltr. and 62 ltr. in the front-wheel
drive and quattro versions respectively.
In the US version and after EU III
takes effect, fuel vapours will be
routed to the ACF system by an
additional vent line connected to
the air vent valve while the
vehicle is being refuelled.
The filler neck cannot be separa-
ted from the fuel tank.
Air vent valve for vehicles with front-wheel
drive and quattro power train
Bypass duct
Activated by
unleaded fuel
valve
Air vent valve
Filler expansion tank
Main expansion
chamber
Filler neck
Housing for gra-
vity float valve
When refuelling the vehicle, the unleaded fuel
valve activates the air vent valve. The valve
seals the main expansion chamber so that no
fuel vapour can escape from this tank when
the vehicle is being refuelled.
The filler expansion chamber is vented by the
filler neck.
SSP207/116
