hanknum

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.

Glyn M Ruck

I guess it's possible - I'm surprised you can hear it. Pumps however make a distinctive noise.

hanknum

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?

WaveyKat

i did mines about a month ago the pump on the Passenger side stop working :-(

sknight

Jesus, went to the dealer and got quoted 140+ euros for the filter.

hanknum

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.

Glyn M Ruck

Good! - we have had a number of filters lately with bad pressure regulators.

arekux

damn i think i just got bad filter, my fuel filter was making humming noise, changed filter still making same noise. It was Mann filter.

hanknum

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.

arekux

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.

hanknum

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.

rabney72

That's exactly what I'd expect for a mb dealer. I can't stand those stuck up *******s. Geesh that's frustrating, I have to stay away from them.
Glad you manned up and called the gm out.

C230 Mulac

subscribing since i have to replace my fuel filter this week

snacks

man now i'm scared to change my fuel filter.

Glyn M Ruck

Don't be - The failure rate is very low. Buy the genuine Mahle.

snacks

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

kvidal661

Hi I have a 2005 c230 Krompressor , how do I relieve the gas pressure in the engine? (pictures would help so much more) Or is opening the gas cap enough?

Glyn M Ruck

Please read this thread & follow the WIS procedure posted earlier in this thread

https://mbworld.org/forums/attachmen...uel-filter.pdf

ncmudbug

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!

kvidal661

i noticed the valve on his car but my engine has a different setup.
maybe ill post a pic of my engine later tonight.

do u mean hose clamps for the fuel filter hoses?

Glyn M Ruck

Yes - I have always released pressure on the fuel rail but Benz obviously does not consider it necessary.

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.

ncmudbug

Yes

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.

pcy

that valve is used to check the fuel pressure.

kvidal661

Can anyone tell me where my schrader valve is? Did anyone considering plugging the hoses connected to the fuel injector with sharpies or pens?

ncmudbug

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...