Fuel tank filler neck — design description (Audi A6 C5)

3.0. Fuel tank filler neck with equalizing tank:
1 - nut. Tightening torque - 2 Nm
2 - heat shield of the fuel tank filler neck
3 - connecting hose
4 - heat shield of the fuel tank filler neck
5 - ventilation hose
6 - fuel tank filler neck hose
7 - sealing ring. To be replaced after each dismantling
8 - gravity fuel leakage prevention valve
9 - ground wire (-)
10 - rubber seal of the filler neck
11 - sealing ring
12 - Fuel tank filler cap
13 - retaining ring
14 - ventilation hose
15 - sealing ring
16 - air valve
17 - bolt. Tightening torque - 23 Nm
18 - filling neck with equalizing tank