Parts Catalog Accessories Catalog Tech Info Tech Forums
  Search our site:    
 Cart  | Project List | Order Status | Help    

Go Back   PeachParts Mercedes ShopForum > Technical Information and Support > Tech Help

LinkBack Thread Tools Display Modes
Old 12-01-2001, 06:05 PM
Registered User
Join Date: Sep 2001
Location: Austin, Tx
Posts: 713
Funny sounds from my 300E...

Hey everyone. Alright... here is the problem. I noticed a little while ago a strange buzzing/whining sound coming from my car. I have isolated it to the region around my back right (if you are looking at the back of the car) wheel. The sound is very similar to the annoying buzz the mercedes generates when you turn off the car... leave your lights on... and open the door. It only happens when the car is on... and is accompanied by a whoosing sound of air, which im guessing is just the sound of the engine exhaust going through the exhaust system. I have a 1992 w124 300E btw... So then... anyone know what is causing the sound... and is it a bad thing? Thanks.
Reply With Quote
Old 12-01-2001, 09:02 PM
JCE's Avatar
JCE JCE is offline
Down to the Wear Bars
Join Date: May 1999
Location: So Kalifornia
Posts: 2,189
Possibly the fuel pumps - that is where they are located on my 87 300E. You might search the archives for fuel pump info as I think previous posters have referred to a buzzing sound from a marginal fuel pump(s).

2003 Firemist Red/grey leather SL 500
2015 Palladium Silver/black mbtex GLK 350
1987 Smoke Silver/burgundy mbtex 300E Sportline (SOLD)

Click to see 87 300E
Reply With Quote
Old 12-01-2001, 10:46 PM
Registered User
Join Date: Sep 2001
Location: Austin, Tx
Posts: 713
Hey.... I did some searching... and I found this
QUOTE]Originally posted by P.E.Haiges
I,m not sure there is a relay. Its a turbine pump and may run all the time that ignition switch is turned on. That's the way mine was. One time when the car wouldn't start, I diagnosed the problem by not hearing the pump turbine whine. A tap with a hammer I (now I know why a hammer is in the MB tool kit) got it going enough to get home.

Your pump may be different, so I hope others can give you more updated info.


do you guys think the sound is just the pump turbine whine? Does anyone's elses' benz exhibit this whining sound?
Reply With Quote
Old 12-02-2001, 01:28 AM
Registered User
Join Date: Jan 2001
Location: Tucson, Arizona
Posts: 758
Buzzing sound is fuel pump


The sound you hear is your fuel pump mainly the check valve ball rattling in it's housing. Not to worry unless the sound stops, where by the pump has stopped pumping as well. If you turn your ignition key to position 2 without starting, you'll probably start hearing that sound for a few seconds before the line pressurizes.

"Tell me and I will listen, Teach me and I will learn, Show me and I will accomplish, Involve me and I will succeed."
'84 300SD 256,000 Gold on Brown (Mileage Award)
'86 300E 246,000 Blue on Tan
Reply With Quote


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
Rebadging '87 300e emr0591 Detailing and Interior 6 09-04-2007 09:12 AM
'86 300E vs '91 300E... Any opinions out there??? pjtib Tech Help 23 05-04-2005 09:26 PM
Parting Out 300e w124 LOW MILES 6cndmbz Mercedes Used Parts For Sale & Wanted 23 10-06-2003 12:29 PM
FS 300e w124 PARTS ON EBAY!!!!!!! 6cndmbz Mercedes Used Parts For Sale & Wanted 4 09-20-2003 12:14 PM
300E engine sounds like diesel upon cold start iodyn Tech Help 3 01-09-2002 10:52 AM

All times are GMT -4. The time now is 06:46 PM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2016, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2011 Pelican Parts - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page