Fuel Filler Hose: Service and Repair

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 - Change-over 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
- To remove, unclip valve upward and lift out.
7 - Ground (GND) connection
- Installed position/check requirements => Fig. 3
- Ensure secure fit of connector at metal ring of fuel filler unit
- Securely tighten eyelet of electrical wire with cap nut => item -8-.
- After installing, check electrical connection of metal ring at fuel filler tube to a blank portion of chassis using multimeter: Specified value: approx. 0 Ohm
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 unclipping sideways and remove from delivery unit.
- Remove hose 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 degrees.
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.

Work sequence







- 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 Ohm