Attention! No open flame near the workplace! No smoking! The workplace must be equipped with a fire extinguisher! Make sure the workplace is well ventilated. Fuel fumes are poisonous. Wear protective goggles when performing work.
Cars with a gasoline engine
The fuel filter for cars with a gasoline engine is located on the bottom of the car under the driver's seat along with an adsorber.
Removing
1. Disconnect the wire from the battery «masses» (-) with the ignition off.
Attention! This removes the security code from the radio, if any. In this case, after connecting the radio, you will need to enter the code. If it is unknown, then the operation of the radio receiver is only possible after entering the code of the MERCEDES workshop or the manufacturer. In this regard, it is recommended that before disconnecting the radio receiver, make sure that the code is known and recorded.
2. Depressurize the fuel system by opening and closing the fuel tank cap.
Attention! Jacking up the vehicle carries the risk of injury. Familiarize yourself with the precautions for jacking up and placing the vehicle on jack stands.
3. Place the vehicle on jack stands.
4. Provide sufficient access to the fuel filter by removing the middle part of the engine guard, see relevant chapter.
5. Mark the fuel hoses with adhesive tape for proper installation.
6. Clamp fuel hoses 1,2 and 3 with appropriate clamps, for example, HAZET-4590-2 (see illustration).
7. Disconnect fuel hoses. Collect the fuel escaping from the hoses with a rag that absorbs liquid well enough, or substitute an appropriate container to collect the escaping fuel.
8. Disconnect the ventilation hose 4 from the fuel filter 5 (see illustration 13.6).
9. Unscrew bolt 6 (see illustration 13.6).
10. Disconnect the adsorber 7 from the guides and remove it together with the fuel filter 5 (see illustration 13.6). 11 Disconnect the fuel filter from the canister.
Installation
12. Connect the new filter to the adsorber.
13. Install the adsorber on the rails and secure it with bolts.
14. Connect the fuel and ventilation hoses to the filter, following the marks made during removal, and secure the hoses with clamps.
15. Reinstall the underbody protection that was removed.
16. Lower the car on wheels.
17. Connect wire terminal «masses» (-) to the negative terminal of the battery when the ignition is off.
18. Enter the security code into the radio and set the electronic clock.
Diesel engine
The fuel filter for vehicles with a diesel engine is located in the engine compartment near the engine.
Removing
19. Disconnect the wire from the battery «masses» (-) with the ignition off.
Attention! This removes the security code from the radio, if any. In this case, after connecting the radio, you will need to enter the code. If it is unknown, then the operation of the radio receiver is only possible after entering the code of the MERCEDES workshop or the manufacturer. In this regard, it is recommended that before disconnecting the radio receiver, make sure that the code is known and recorded.
Attention! Collect the fuel flowing out when removing the fuel filter with a rag that absorbs liquid well enough, or substitute an appropriate container to collect it.
20. Disconnect the hose 1 from the injection pump on the fuel filter 2. To do this, pull out the retaining clip 3 as far as it will go, as shown by the arrow in the illustration, and disconnect the hose (see illustration).
Attention! Immediately after removing the hose, return the locking clip to its original position, because the clip must not be left unlocked for a long time.
21. Mark fuel hoses 4, 5 and 6 with adhesive tape, loosen the hose clamps and slide them onto the hoses. Then disconnect the hoses (see illustration 13.20).
22. Unscrew the three bolts securing the fuel filter to the intake manifold and remove it.
Installation
23. Install a new fuel filter in place on the intake manifold and secure with bolts with a tightening torque of 9 Nm.
24. Connect fuel hoses to the filter, being guided by their designation made before removal, and fix collars.
25. Check the condition of the o-ring at the transparent fuel hose joint and make sure that the o-ring is not damaged or porous. Replace sealing ring if necessary.
26. Check the position of the locking bracket. If the locking bracket has been unlocked for a long time, then it is necessary to change the fuel line as a set.
27. Slide the fuel line onto the filter fitting and make sure it is tight by sliding it over the fitting.
28. Connect wire terminal «masses» (-) to the negative terminal of the battery when the ignition is off.
29. Enter the security code into the radio and set the electronic clock.