Fuel Filler Neck: Service and Repair

Fuel tank filler tube, disassembling and assembling







1 Cap
2 Seal
- Replace if damaged
3 Mounting screw
4 Tank lid unit
- with rubber cap
5 Gravity valve
- To remove, unclip valve upward from connection
- Checking valve for throughput Valve vertical: open,Valve tilted 45 degrees: closed
6 O-ring
- Replace if damaged
7 Sleeve
8 Bleeder valve
- to remove, unclip valve sideways from connection
- before installing, unscrew cap, item 1
- Checking Fig. 1
9 Combination protection valve
- for fueling ventilation
- Note installation position: white valve-side to filler flanger bottom
10 Pressure retention valve
- Checking Fig. 2
11 Fork
12 Connection piece
- Check for secure fitting
- To disengage, squeeze together at front
13 15 Nm
14 Vent line
- to fork at EVAP canister, item 17
- Check for secure fitting
- secure with spring type clamps
15 Check-valve
- Note installation position: gray valve-side faces toward the sealing cap item 1
16 Vent line
- Check for secure fitting
- secure with spring type clamps
17 Vent line
- Check for secure fitting
- secure with spring type clamps
18 Connection hose
- to connection sleeve at fuel tank, item 11
- Check for secure fitting
19 Supply line
- from Fuel Pump (FP) in auxiliary fuel tank, item 3
- Check for secure fitting
- secure with spring type clamps
20 Vent line
- from connection sleeve at auxiliary fuel tank, item 8
- Check for secure fitting
- secure with spring type clamps
21 Cover plate
22 Fuel tank filler tube
23 Check-valve
- Note installation position: gray valve-side faces toward the floater valve item 25
24 Ground (GND) connection
- Check for secure fitting
25 Floater valve
- for fueling ventilation

Fig. 1 Checking bleeder valve







Lever in rest position: closed Lever pressed in direction of arrow: open


NOTE: Before installing valve, unscrew cover from fuel tank.


Fig. 2 Checking pressure retaining valve







The pressure retaining valve is opened in both flow directions (arrow 1) on the gravity valve side (item 5 ).

It is only opened in one flow direction (arrow 2) on the side of the changeover valve (item 8 ).