GUIDE: Replacing your fuel filter (W208)

[JSeaman]

Step 1 - Jack up the rear offside nice and high so you have room to work (don't make the job harder by cramming yourself in a tiny gap). Secure the car with

axle stands

Step 2 - Locate the plastic cover over the fuel pump, this i just in front of the suspension as shown

 

[JSeaman]

Step 3 - There are three plastic 10mm nuts that hold the plastic undertray on, you will need a couple of extension bars on your ratchet to reach them through

the holes cut out in the plastic cover as shown

Step 4 - Remove the 3 nuts then wriggle the plastic undertray out. It is quite squashy so easy enough to move around but it is a little awkward - don't just

tug it because you could damage pipework

 

[JSeaman]

Step 5 - You will now see two metal cylinders, one is the fuel pump (the smaller one) and the other is your fuel filter. I have circled both on the picture

Step 6 - Hopefully your filter carrier will be in better shape than mine, if so then release the carrier so you can access the filter

Step 7 - Now onto the pipework, you have 4 connections to deal with, the first is easy just pull it off

 

[JSeaman]

Step 8 - Next is the output line which runs to the fuel rail, this one will leak quite a bit of fuel so have a vessel ready to catch it. When you release the

jubilee clip it will start leaking so get some goggles on and make sure you're not right under it!

Step 9 - Next is the link between the filter and fuel pump, again, this one isn't too bad and won't leak loads so you can take it off and replace the pipe if

it is in bad shape. It's worth inspecting the hoses if you can as there are often defects you can't see on the car, I highlighted one of mine in the second

picture

 

[JSeaman]

Step 10 - Be prepared to fit an array of new jubilee clips as required! They get very tired under the car and you are likely to need to replace some of them

Step 11 - Finally, there is the main feed line which will leak a lot of fuel. The way I did this was to switch over each pipe one at a time to the new filter

, finishing with this one. If you try and disconnect all 4 then change it over you'll spill a lot of petrol!

Step 12 - Reattach your pump, I had to do it with a cable tie!

 

[JSeaman]

Step 13 - Once everything is back together, fire up the car and check for leaks

Step 14 - Now slide the cover bak up (two bolt holes are nearest the wheel and the single bolt hole nearest the centre of the car). Be careful not to hook on

any of the wires. One thing I forgot to mention, check all the rubber mounts are hooked up (I circled two of them on the second picture) before you cover it

up

Step 15 - Tighten up the 3 plastic 10mm nuts and drop the car down off the jack

 

[Miffy]

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http://forums.mercedesclub.org.uk/showthread.php?t=100563