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Replacing Your Fuel Filter
 
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Pelican Technical Article:

Replacing Your Fuel Filter

Steve Vernon

Time:

1 hour1 hr

Tab:

2

Tools:

T25 Torx, hose clamps, screw driver, cutters

Applicable Models:

Mercedes-Benz ML320 (1998-03)
Mercedes-Benz W203 (2001-07)

Parts Required:

Fuel Filter

Hot Tip:

Make sure filter faces right direction

Performance Gain:

Proper fuel pressure

Complementary Modification:

New injectors

Your fuel filter is an integral part of the fuel delivery system. A clogged filter can cause all kinds of problems, from a rough running engine to leaving you stranded on the side of the road. Mercedes suggests changing your filter every 30,000 miles.

The Mercedes C320 fuel filter is located on the underside of the car, behind the rear left side seat. You will need to safely lift and support your car. Please see our article on jacking up your Mercedes-Benz.

Remove the gas cap to depressurize the system.

Once the car is safely supported, you will need to remove the under body tray until it gives you enough room to work on the filter. Please see our article on removing your under body trays.

You will begin by removing the T25 Torx screw holding the filter in place.

Move the filter out of its holding bracket to give you more room to work. You will need to pinch off all four gas lines coming into and out of the filter. Make sure to mark the lines and take pictures so you do not mix them up during reassembly. You can use a hose clamp tool or I use a shop rag to protect the lines then pinch them between vice grips. Remove the hose clamps and then remove the lines from the filter.

The filters need the fuel to flow through them in one direction. While the filter really only will fit all the lines one way make sure you match up the markings on the new filter to the one you are removing.

Install the new filter using new clamps (red arrow). With everything in place, turn on the ignition and check for leaks. Turn off the ignition, reinstall the under body tray and you are good to go.

The fuel filter is located behind the rear seat on the left side of the car (red arrow).
Figure 1

The fuel filter is located behind the rear seat on the left side of the car (red arrow). You only need to remove enough of the under body tray to give you access to work on the pump. The left and right side body under trays are held in place by eight 10mm nylon nuts (green arrows). The front and rear outside nuts also assist in holding the wheel well liners.

You will begin by removing the T25 Torx screw holding the filter in place (red arrow).
Figure 2

You will begin by removing the T25 Torx screw holding the filter in place (red arrow). Move the filter out of its holding bracket to give you more room to work. You will need to pinch off all four gas lines coming into and out of the filter (yellow arrows). Make sure to mark the lines and take pictures so you do not mix them up during reassembly.

You can use a hose clamp tool or I use a shop rag to protect the lines then pinch them between vice grips (yellow arrow).
Figure 3

You can use a hose clamp tool or I use a shop rag to protect the lines then pinch them between vice grips (yellow arrow). Remove the hose clamps and then remove the lines from the filter (green arrow).

The filters need the fuel to flow through them in one direction.
Figure 4

The filters need the fuel to flow through them in one direction. While the filter really only will fit all the lines one way make sure you match up the markings on the new filter to the one you are removing.

Install the new filter using new clamps (red arrow).
Figure 5

Install the new filter using new clamps (red arrow). With everything in place, turn on the ignition and check for leaks. Turn off the ignition, reinstall the under body tray and you are good to go.

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Comments and Suggestions:
peaybe Comments: I have M/B E320 CDI and I wanted to change the Fuel filter, which sits on top of the engine under the engine covers. Your video refers to C320 which seems to have the fuel filter under the body. This information is misleading, please correct it.
October 18, 2016
  Followup from the Pelican Staff: This tech article applies to
C320
Mercedes-Benz ML320 (1998-03)
Mercedes-Benz W203 (2001-07) - Nick at Pelican Parts
 
dqjeff Comments: the fuel filter on my car is not where described in this article, do some models have them in another location? I have a 2006 c350 sport, thanks.
October 7, 2016
  Followup from the Pelican Staff: Article is for C230 models.

On C250 models the filter is in the fuel tank sending unit, opposite side of the filler neck. - Nick at Pelican Parts
 
Sammyiks Comments: My 2004 C240 W203 runs performs extraordinarily but some times stall when rev t take off. And the fuel consumption has gone a little higher to. Could this be the fuel filter or the nozzles? The idle is good but when starting motion early in the morning, it hesitates a little then moves just fine. But the occasional stall I can't understand.
October 6, 2016
  Followup from the Pelican Staff: Could be an issue with the fuel pump. I would perform a fuel delivery system test. Check fuel pressure, volume and quality.
- Nick at Pelican Parts
 
wilson Comments: what is the size for the 4 hose clamps of the fuel filter so that it fits well for MB c230 compressor
September 22, 2016
  Followup from the Pelican Staff: I am not 100% sure. Give The Pelican Parts parts specialists a call at 1-888-280-7799. They can figure out size they are.
- Nick at Pelican Parts
 
aj Comments: will this filter be the same for my 180 as i think a friend has placed my new filter the wrong way as my car runs but when it idles at stop signs i will go to cut out unless i put it into neutral and give it more reves
July 30, 2016
  Followup from the Pelican Staff: What is the year and model of your vehicle? - Nick at Pelican Parts  
c320 rider Comments: if i mix the lines and reassembly in wrong direction, the car could start up or no?
because after changing i have to many trouble codes in my reader now.
thanks
March 29, 2016
  Followup from the Pelican Staff: No, it would not start. - Nick at Pelican Parts  
sckid13 Comments: Mercedes c230 kompressor
March 7, 2016
  Followup from the Pelican Staff: got it, thanks. - Nick at Pelican Parts  
sckid13 Comments: Me ceded 23p kompressor runs great but when I get on the gas it falls into limp mode and stumbles?
March 7, 2016
  Followup from the Pelican Staff: Could be an issue with the fuel pump. I would perform a fuel delivery system test. Check fuel pressure, volume and quality.
- Nick at Pelican Parts
 
Chris Comments: Thanks very good DYI article. Thank you for the thoughtful effort.
If you had a suggested picture of how the floor pan is removed just enough to work on the filter. It might help better understand the effort.
Thank you
December 7, 2015
  Followup from the Pelican Staff: Thanks for the additional info and feedback. We appreciate it.
- Nick at Pelican Parts
 
Peter S Comments: Just bought a C280 1997 gas automatic. This car has been lying up in a garage for a while. Seemed to run good before I changed the battery . Now it misfires and runs rough in idle . Also there's alot of carbon coming from exhaust. There could be a number things wrong with it . The check engine light is on .the car is using alot of gas plus the fuems from the exhaust would almost kill you. The only thing I have done so far is changed the spark plugs.
Can anybody she'd some light
October 6, 2015
  Followup from the Pelican Staff: You may have damaged something during the spark plug procedure. Check for a spark issue at each cylinder. - Nick at Pelican Parts  
Brian Comments: I replaced the fuel filter on my 2003 c320 like the article with no problems. However, car cranks and does not start. Schrader valve has no pressure. The car ran fine before I changed the filter so a bad pump just doesn't seem likely. Tank has a little over 1/4 tank. Thoughts?
August 19, 2015
  Followup from the Pelican Staff: Check if the filter is installed backward. - Nick at Pelican Parts  
David Comments: Why after I replace the fuel filter makes a buzzing noise. Sounds like is coming from the same area where the fuel filter is.
September 14, 2014
  Followup from the Pelican Staff: Maybe the filter is loose and the fuel passing through it is causing it to vibrate. - Nick at Pelican Parts  
Javi2001 Comments: Need to change fuel filter body ? or just the inside paper filter
June 30, 2014
  Followup from the Pelican Staff: You will have to change the entire filter. - Nick at Pelican Parts  
Pelican customer Comments: May be helpful on this article to show the hoses being clamped off, that is the most critical step to the process.
February 8, 2014
  Followup from the Pelican Staff: Thanks for the feedback, I will have the info added. - Nick at Pelican Parts  
Pelican customer Comments: Your website articles are very helpful. It would help your customers if you crossed checked them and made sure they were available in all appropriate models. For example, this article applies to 98-04 W210, but I found it under W203. Certainly not a criticism, just a comment.
February 8, 2014
  Followup from the Pelican Staff: Thanks for the feedback. I'll look into this issue. - Nick at Pelican Parts  

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