DIY - Fuel Filter Replacement
Super Member
Joined: Jun 2005
Posts: 651
Likes: 5
From: So. Cal.
'02 C320 Wagon, '78 308 GTS, '06 Highlander Hybrid
I just checked...it is the pump making the humming noise (pretty loud too). I'll go back to the dealership and see what they can do about the filter...I'm not going to hold my breath though. Anyone have a recommendation on where to get the best deal on a filter?
The car does have 125k on it, but I find it hard to believe that the pump all of a sudden has problems after the filter is changed.
BTW, the tech I spoke to said that he had seen a few defective filters and that they can make noise if it is leaking past the diaphragm.
The car does have 125k on it, but I find it hard to believe that the pump all of a sudden has problems after the filter is changed.
BTW, the tech I spoke to said that he had seen a few defective filters and that they can make noise if it is leaking past the diaphragm.
Super Member
Joined: Jun 2005
Posts: 651
Likes: 5
From: So. Cal.
'02 C320 Wagon, '78 308 GTS, '06 Highlander Hybrid
Yes, it is a high pitch humming noise from the pump. I'm going to R&R the filter first to see if that is causing the problem.
Any recommendations on where to get a filter?
Any recommendations on where to get a filter?
Super Member
Joined: Jun 2005
Posts: 651
Likes: 5
From: So. Cal.
'02 C320 Wagon, '78 308 GTS, '06 Highlander Hybrid
I changed out the OEM filter that I got from the dealer (I installed it about 3 months ago). I bought a WIX (actually MANN) from Kragen. When I changed it I went to bleed the system from the fuel rail and barely anything dribbled out. I pulled the filter and there was no pressure in the system (when I changed the filter before fuel sprayed everywhere). I definitely think I got a bad filter.
Anyways...no more humming noise.
I'm going to take the filter back to the dealer, but I'm not holding my breath on getting anything back.
Anyways...no more humming noise.
I'm going to take the filter back to the dealer, but I'm not holding my breath on getting anything back.
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Super Member
Joined: Jun 2005
Posts: 651
Likes: 5
From: So. Cal.
'02 C320 Wagon, '78 308 GTS, '06 Highlander Hybrid
Check to see if the noise is actually coming from the filter (it may be coming from the pump). If it is coming from the filter...did you get two bad filters, seems unlikely. If it is coming from your pump, then it sounds like your pump is dying.
Senior Member
Joined: Mar 2010
Posts: 347
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From: SF Bay Area
2006 C55 AMG
I replaced my old filter, sounds like its coming from filter I out my ear next to it. Old filter gas been making that noise for 20k miles.
Super Member
Joined: Jun 2005
Posts: 651
Likes: 5
From: So. Cal.
'02 C320 Wagon, '78 308 GTS, '06 Highlander Hybrid
Just a FYI...
Went to the dealer to return my fuel filter today...got there at 12:35pm to find out that parts takes lunch from 12-1 so I had to wait half an hour. Told the parts guy that I wanted to return the filter and he said since I didn't have the original packaging that he could not do anything until the parts manager got in on Mon. I told him that I live 40 miles away, he said there was nothing he could do. I asked for the service manager (he said he wasn't there), then the general manager. The GM came and said that they would have to test the fuel filter first (how he was going to do that I'm not sure). He came back after talking to a technician and asked exactly what the symptoms I was having. I told him that I was getting a high pitched humming noise, he said that the tech had only seen one other defective filter and it was making that exact sound. The GM said they will reimburse me via the mail.
Went to the dealer to return my fuel filter today...got there at 12:35pm to find out that parts takes lunch from 12-1 so I had to wait half an hour. Told the parts guy that I wanted to return the filter and he said since I didn't have the original packaging that he could not do anything until the parts manager got in on Mon. I told him that I live 40 miles away, he said there was nothing he could do. I asked for the service manager (he said he wasn't there), then the general manager. The GM came and said that they would have to test the fuel filter first (how he was going to do that I'm not sure). He came back after talking to a technician and asked exactly what the symptoms I was having. I told him that I was getting a high pitched humming noise, he said that the tech had only seen one other defective filter and it was making that exact sound. The GM said they will reimburse me via the mail.
Member
Joined: Feb 2009
Posts: 82
Likes: 2
C230
Just a FYI...
Went to the dealer to return my fuel filter today...got there at 12:35pm to find out that parts takes lunch from 12-1 so I had to wait half an hour. Told the parts guy that I wanted to return the filter and he said since I didn't have the original packaging that he could not do anything until the parts manager got in on Mon. I told him that I live 40 miles away, he said there was nothing he could do. I asked for the service manager (he said he wasn't there), then the general manager. The GM came and said that they would have to test the fuel filter first (how he was going to do that I'm not sure). He came back after talking to a technician and asked exactly what the symptoms I was having. I told him that I was getting a high pitched humming noise, he said that the tech had only seen one other defective filter and it was making that exact sound. The GM said they will reimburse me via the mail.
Went to the dealer to return my fuel filter today...got there at 12:35pm to find out that parts takes lunch from 12-1 so I had to wait half an hour. Told the parts guy that I wanted to return the filter and he said since I didn't have the original packaging that he could not do anything until the parts manager got in on Mon. I told him that I live 40 miles away, he said there was nothing he could do. I asked for the service manager (he said he wasn't there), then the general manager. The GM came and said that they would have to test the fuel filter first (how he was going to do that I'm not sure). He came back after talking to a technician and asked exactly what the symptoms I was having. I told him that I was getting a high pitched humming noise, he said that the tech had only seen one other defective filter and it was making that exact sound. The GM said they will reimburse me via the mail.
Glad you manned up and called the gm out.
Member
Joined: May 2009
Posts: 153
Likes: 0
2006 c230
Just wanted to make sure been using oem Mahler for all my filters. Was concerned when I heard people having issues with oem.
I'm planning to do the fuel filter change along with my oil change in a few hours, I'm glad you replied Glyn I'm reassured now that all is good
I'm planning to do the fuel filter change along with my oil change in a few hours, I'm glad you replied Glyn I'm reassured now that all is good
Super Moderator
Joined: Jun 2008
Posts: 19,942
Likes: 192
From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
Please read this thread & follow the WIS procedure posted earlier in this thread
https://mbworld.org/forums/attachmen...uel-filter.pdf
https://mbworld.org/forums/attachmen...uel-filter.pdf
MBWorld Fanatic!
Joined: Sep 2010
Posts: 1,434
Likes: 4
From: Raleigh, NC
2005 C230K, 2019 Honda CR-V, '74 Lotus Europa
The document didn't mention the schrader valve (IIRC it was near the rear of the cam cover) to release the pressure... I did that, but I didn't know to open the gas cap. Maybe I'm lucky, but it worked out for me.
As a recommendation I would remind kvidal661 to use the fuel injection hose clamps you can get at the auto parts store. You'll probably need the two smallest sizes (sorry can't remember which ones I bought). I think they clamp the hose a bit better than the standard worm gear type clamp although they would probably work, too. Of course, maybe I'm missing the trick for reusing the standard MB hose clamps!
As a recommendation I would remind kvidal661 to use the fuel injection hose clamps you can get at the auto parts store. You'll probably need the two smallest sizes (sorry can't remember which ones I bought). I think they clamp the hose a bit better than the standard worm gear type clamp although they would probably work, too. Of course, maybe I'm missing the trick for reusing the standard MB hose clamps!
Super Moderator
Joined: Jun 2008
Posts: 19,942
Likes: 192
From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
The document didn't mention the schrader valve (IIRC it was near the rear of the cam cover) to release the pressure... I did that, but I didn't know to open the gas cap. Maybe I'm lucky, but it worked out for me.
As a recommendation I would remind kvidal661 to use the fuel injection hose clamps you can get at the auto parts store. You'll probably need the two smallest sizes (sorry can't remember which ones I bought). I think they clamp the hose a bit better than the standard worm gear type clamp although they would probably work, too. Of course, maybe I'm missing the trick for reusing the standard MB hose clamps!
As a recommendation I would remind kvidal661 to use the fuel injection hose clamps you can get at the auto parts store. You'll probably need the two smallest sizes (sorry can't remember which ones I bought). I think they clamp the hose a bit better than the standard worm gear type clamp although they would probably work, too. Of course, maybe I'm missing the trick for reusing the standard MB hose clamps!
The M271 4 cylinder uses a different fuel injection system from the M112, M113, M272 V6 engines. Fire wall & purge valve back is identical though with the exception of filter in tank on AMG C32 & newer M272 engined cars.
MBWorld Fanatic!
Joined: Sep 2010
Posts: 1,434
Likes: 4
From: Raleigh, NC
2005 C230K, 2019 Honda CR-V, '74 Lotus Europa
Glyn, I think I think I forgot to relieve the fuel pressure on one of my cars and it was a shock when I loosened one of the hose clamps at the filter. I would advise relieving the pressure (wonder what other use there is for the schrader valve?), but it's not a huge deal. It's just nicer.
MBWorld Fanatic!
Joined: Sep 2010
Posts: 1,434
Likes: 4
From: Raleigh, NC
2005 C230K, 2019 Honda CR-V, '74 Lotus Europa
Yep. I plugged the lines after I disconnected them with a punch, but after you release the pressure, it isn't that big of a deal. Have a drain pan there and you'll be fine.
Ahh... So that's what it's there for...
that valve is used to check the fuel pressure.
