Fuel Filter: Service and Repair

Fuel tank and attachments / fuel filter, removing and installing





1. Cover
2. Seal ^Replace if damaged
3. 1 Nm
4. Tank flap unit
^ With rubber cup
5. 10 Nm
6. Breather pipe
7. Change-over valve
^ To remove valve unclip sideways out of socket
^ Remove cap item -1- before installing
^ Check; Refer to Fig 2.
8. O-ring
^ Replace if damaged
9. To EVAP canister
10. Cable guide
^ In longitudinal member
11. Breather pipe
12. Fuel tank
^ For fuel tank
14. Clamping washer
15. Fuel tank cover
16. 20 Nm + 1/4 turn (90°) further
17. Securing strap
18. Fuel filter
19. Screw-type clip
^ Observe installed position
20. Supply line
^ Black
^ Check if seated securely
^ To pull off of fuel filter press locking ring inward on connecting piece
21. Breather pipe
22. Seal
^ Replace if damaged
^ When installing, insert seal dry into fuel tank opening
^ Moisten with fuel only when installing fuel delivery unit flange.
23. Fuel delivery unit
^ Observe installed position of flange on fuel tank; Refer to Fig 1.
24. Union nut, 75 Nm
^ Remove and install with key 3217
25. Supply line
26. Return line
27. Gravity valve
28. Pressure retention valve
^ For fuel tank breather
^ Checking; Refer to Fig 3.
29. Ground connection
^ Check if seated securely





Fig. 1 Installed position of flange of fuel delivery unit
Marking on sender must align with the marking on fuel tank (arrows).
Blue or blue marked return line -1- to connection with identification -R-.
Black supply line -2- to connection with identification -V-.

Note: After installing fuel delivery unit flange, check that the supply, return and breather pipes are still clipped onto the fuel tank.





Fig. 2 Checking change-over valve
Lever in rest position: Closed
Lever pushed in direction of arrow: Open

Note: Before installing vent valve remove cap from fuel tank.





Fig. 3 Checking pressure retention valve
The pressure retention valve is opened in both through-flow directions from the gravity valve/pressure retention valve (arrow -1-).
It is opened only in one through-flow direction from the EVAP system/solenoid valve junction piece (arrow -2-).

Checking direction of valve flow
A) Union 1 - 1:
^ Flow in both directions
^ Union -2- is closed
B) Union 1 - 2:
^ Flow in both directions
^ Union -3- is closed
C) Union 1 - 2:
^ Flow in only one direction
^ Union -3- is closed
^ Valve must close when a vacuum is applied to union -1 -





Fig. 4 Installed position of screw-type clamp for fuel filter

Note: The fuel filter is illustrated viewed from the front.

^ Install screw-type clamp (arrow) as shown in illustration.
Ensure sufficient clearance between clamp fastener and fuel tank:
Dimension "a" must be at least 5 mm





Fig. 5 Removing and installing fuel pressure regulator
1. Fuel filter
^ Arrows show flow direction
2. Rubber hose
3. Retaining clip
^ Check if seated securely
4. Ground strap
^ Mounted on fuel filter retainer
5. Supply pipe
^ From fuel pump
6. Return pipe
^ To fuel pump
7. Fuel pressure regulator
8. Seal
^ Replace
9. O-ring
^ Replace
10. Supply pipe
^ To union in fuel tank