1 | Threaded cap (fuel filter) |
3 | Threaded cap (fuel prefilter) |
4 | Hand pump |
N47.20-2170-11
Warning | Risk of accident from vehicle starting off by itself when engine running. Risk of injury (bruises and burns) resulting from working on the engine while it is being started or when it is running. | Secure vehicle to prevent it from starting off by itself. Wear closed and snug-fitting work clothes. Do not touch hot or rotating parts. | |
Danger | Risk of explosion caused by fuel igniting, risk of poisoning caused by inhaling and swallowing fuel as well as risk of injury to eyes and skin caused by contactwith fuel. | No fires, sparks, open flames or smoking. Pour fuels into suitable and appropriately marked containers only. | |
Topical note | Notes on avoiding damage through contamination and foreign objects | ||
| Remove | ||
1 | Open cap of fuel tank and close again. | Open cap to dissipate the overpressure in the fuel tank. | |
2 | Clean are surrounding fuel filter module. | ||
3 | Replace fuel filter. | ||
4 | Unscrew threaded cap (3) of fuel prefilter. | Remove the threaded cap (3) with filter insert after the fuel has flowed out of the fuel filter housing. | |
5 | Remove threaded cap (3) of fuel prefilter with filter element from fuel filter housing, and unclip filter element by pushing at sides. | | |
| Install | ||
6 | Replace sealing ring on threaded cap (3) of fuel prefilter and grease lightly. | MB multipurpose grease, 400 g | |
7 | Insert new filter element into threaded cap (3) of fuel prefilter. | ||
8 | Screw on threaded cap (3) of fuel prefilter with filter element and tighten. | Engine 470.9, 471.9Fuel prefilter cover to fuel filter module | |
9 | Release handle of hand pump (4) by turning it. | ||
10 | Operate hand pump (4) until a back pressure is noticeable when pumping. | ||
11 | Tighten handle of hand pump (4). | ||
| Check | ||
12 | Check leak tightness of fuel filter module with engine running. | Perform a visual inspection only and then switch off the engine. | |
13 | Delete "Fuel filter replacement due" or "Fuel filter clogged" errors using the vehicle diagnosis system. | Only if fault code was shown beforehand. | |
See information from body manufacturer. | |||
14 | Confirm replacement of air filter element in maintenance booklet. |