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Pelican Technical Article:

Fuel Filter Replacement

Steve Vernon

Time:

3 hours3 hrs

Tab:

$100 to $190

Talent:

**

Tools:

8mm socket, large flathead screwdriver, hammer

Applicable Models:

Mercedes-Benz C250 (2012-14)
Mercedes-Benz C300 (2008-14)
Mercedes-Benz C350 (2008-14)

Parts Required:

Fuel filter, fuel filter-sealing O-ring

Hot Tip:

Be careful working around gas

Performance Gain:

Better running engine

Complementary Modification:

Detail the interior

A clogged and faulty fuel filter can cause poor engine performance. When they get completely clogged you may be left with an engine that doesn't run at all. If you are getting an error code for the pump make sure to replace it right away before it leaves you stranded on the side of the road.

There are a host of different fuel filters for the W204, and all of them are VIN specific. If you are going to replace yours, please make sure to have your VIN handy when ordering because your vehicle will not run with the wrong filter installed. There are also different procedures for the different filters but this article will cover the filter on our May 2008 C350.

It is best to replace your fuel filter with the fuel tank drained. This reduces the amount of possible spilled fuel and fuel vapors. Wear proper clothing, gloves and safety glasses when working with gas. When replacing, work in a well-ventilated area. Working outdoors is a good choice. Do not use incandescent work lights or power tools, and DO NOT smoke. Fuel and fuel vapors are highly combustible.

Begin by opening the fuel filler door and removing the gas cap.
Figure 1

Begin by opening the fuel filler door and removing the gas cap. This will help relieve pressure in the system.

You will need to disconnect the fuel lines from the pump to replace the filter.
Figure 2

You will need to disconnect the fuel lines from the pump to replace the filter. In our project car so you need to access both the filter and pump. Both are located under the rear seat with the pump on the right side (red arrow) and the filter on the left (yellow arrow). You need to remove the rear seat so please see our article on seat removal for additional assistance.

There are two fuel lines that need to be disconnected from the fuel pump on the right side (red arrows).
Figure 3

There are two fuel lines that need to be disconnected from the fuel pump on the right side (red arrows). Please see our article on fuel pump replacement for additional information on how to access and remove these lines.

With the rear seat removed you can see the access cover for the fuel filter.
Figure 4

With the rear seat removed you can see the access cover for the fuel filter. Use a 8mm socket and remove the four bolts (red arrows). Lift the cover off taking care to peel away the sealant gasket around the wiring connection.

The filter is located under the access cover.
Figure 5

The filter is located under the access cover. Begin removing it by disconnecting the two electrical connections (red arrows). Then give a good cleaning around the retaining ring and lid.

You will need to remove the locking ring that holds the filter in place in the gas tank.
Figure 6

You will need to remove the locking ring that holds the filter in place in the gas tank. While Mercedes makes an expensive tool for doing this if you are careful you can use a large flathead screwdriver and small hammer and gently tap the ring back off the tabs. Use the holes in the outer retaining ring and tap evenly around the entire outside of the ring. Do not just start hammering away on one spot. Instead, continuously move around the ring. There should be a witness mark on the ring (red arrow) that will let you know when it is fully locked (the one on the photograph is unlocked). With the ring unlocked remove the fuel line by squeezing in the tab and lifting it off the filter (yellow arrow). A little fuel will spill out so be prepared to catch it and dispose of it correctly.

Remove the retaining ring and note the position of the filter in the tank.
Figure 7

Remove the retaining ring and note the position of the filter in the tank. The large tab on the front of the filter must face towards the front of the vehicle (red arrow).

You can now lift the filter out from the tank.
Figure 8

You can now lift the filter out from the tank. Use care that you do not bend or damage the left side level detector (red arrow). Remove the filter with the hoses to the pump (yellow arrow) attached. The fuel pressure sensor is attached to the top of the filter and can be transferred to the new filter by removing the retaining ring and installing it the new filter. Please see our article on fuel pressure sensor replacement. Installation is the reverse of removal. Make sure that the lid is positioned and sealed correctly.

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Comments and Suggestions:
Lapstoo Comments: That car had to have been in a flood or something similar. I was wondering earlier why the engine bay was so dirty while reading another DIY... Now that I see underneath the rear seat, and on top of the fuel filter... So much for a sealant gasket around the openin to the fuel filter/pump/gas tank...

Way to go Pelican Parts...

Doing what you can to rescue a Mercedes Benz from the humiliation of having to spend its life in a junk yard getting pocked and prodded by a domestic made car or two...
March 20, 2016
  Followup from the Pelican Staff: Thanks for the note and feedback. We appreciate it.
- Nick at Pelican Parts
 

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