AWD

Fuel filler tube, component overview





1. Pressure retention valve
^ Clipped to fuel filler unit
^ Closes vent line when vacuum from intake manifold is present
^ Only remove together with vent line and gravity valve
2. Vent valve
3. O-rings
^ Different sizes
^ Always replace
4. Seal
^ Installed position: sealing lip faces fuel filler unit
5. O-ring
^ Always replace
6. Gravity valve
^ Only remove together with vent line and pressure retention valve
^ Checking, Refer to Fig. 2
^ To remove, unclip valve upward and lift out.
7. Ground (GND) connection
^ Installed position/check requirements, Refer to Fig.3
^ Ensure secure fit of connector at metal ring of fuel filler unit
^ Securely tighten eyelet of electrical wire with cap nut, Refer to item - 8 -.
^ After installing, check electrical connection of metal ring at fuel filler tube to a blank portion of chassis using multimeter:
^ Specified value: approximately 0 Ohms
8. Cap nut -10 Nm
9. Vent line
^ To EVAP canister





Fig. 1 Removing, installing, and checking change-over valve
Removing

^ Remove fuel tank.
^ Remove valve by uncapping sideways and remove from delivery unit.
^ Remove hose coupling by pressing release button.

Checking
^ Blow into hose -2-.
- Button -1- at rest: it must not be possible to blow through hose.
- Button -1- pressed in direction of arrow: it must be possible to blow through hose.





Fig. 2 Removing, installing, and checking gravity valve
Removing

Note: Gravity valve -1- can only be replaced together with pressure retention valve and vent line -3-.

^ Remove fuel tank.
^ Unclip pressure retention valve.
^ To remove, unclip gravity valve upward and lift out.

Checking
^ Hold valve in installation position.
It must be possible to blow through hose.
^ Tilt valve 45°.
It must not be possible to blow through hose.

Note: O-ring -2- must not be damaged; replace if necessary.





Fig. 3 Installation position of Ground (GND) connection
^ Route Ground (GND) connection as shown in figure.
^ Ensure connector -2- of Ground (GND) connection fits securely at metal ring -1- of fuel filler tube.
^ Disconnect Ground (GND) connection at both retaining clips (arrow).

Note: Depending on construction version, a cable binder may be implemented in place of a clip.





Test provision
^ Tighten eyelet of electrical wire -1- at chassis using cap nut -2- (10 Nm).
^ After installing, check electrical Ground connection using an ohmmeter between metal ring of fuel filler tube and chassis.
Specified value 0 Ohms