300SE fuel pump relay-location?? - Page 2 - Mercedes-Benz Forum

LinkBack Thread Tools Display Modes
post #11 of 13 (permalink) Old 05-06-2005, 01:57 PM
BenzWorld Elite
talbir's Avatar
Date registered: Dec 2004
Location: London UK
Posts: 1,831
Mentioned: 0 Post(s)
Quoted: 2 Post(s)
RE: 300SE fuel pump relay-location??

On the HT leads, only original MB leads have resistors that screw on/off. Replacement HT leads are one piece, all the way from dist cap to spark plug. So it'll depend on which ones have been installed.

Where are you located ? I am happy to meet you and you can try out the ful pump relay from my 300SE. I can also test to confirm whether it's fuel pump relay or ECU voltage issue. And I have a spare HT lead if you require. ( I have far too many spares in my garage at home!)

I am near Heathrow airport, based in Uxbridge. Could always meet somewhere and I can take a look for you.

Email me on sharanbains@hotmail.com if I can be of assistance.


Mercedes w124 500E 1993 Black 040
Mercedes w124 500E 1993 Spruce Green
Mercedes AMG 560SEC 1988
Mercedes AMG DOHC M117 w126 AMG Widebody SEC 1985
Mercedes 560SE Carat Duchatelet 1987
Mercedes w126 SEL Brabus
Mercedes w124 T Brabus
Porsche 911 Turbo SE Slantnose 1986
Mercedes 560E - w124 5.6 DOHC 360bhp by Stratton
Ferrari 328 GTS Quattrovalvole 1986 Koenig Widebody
Porsche 928 S4 by Strosek, Supercharged 550bhp
Mercedes 190E AMG Widebody
Mercedes SEC by Gemballa 6.9
talbir is offline  
Sponsored Links
post #12 of 13 (permalink) Old 05-06-2005, 06:07 PM
BenzWorld Elite
jdc1244's Avatar
Date registered: Jun 2003
Vehicle: 1991 300 SE
Location: Lakeland, Florida
Posts: 18,534
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
RE: 300SE fuel pump relay-location??

If there were a problem with the ECU than I would suspect you’d experience more pronounced problems such as rough idle and stalls, not just a dead engine. The ECU is item five in the picture below. The ECU receives data from the many system sensors, such as the engine temp sensor, and uses that information to make needed adjustments to the fuel system via switches and valves, such as the EHA, item four (“pressure actuator�). Since you are not experiencing any of the associated problems with a bad ECU, I think you’re safe to replace the relay.

Last edited by administrator; 08-14-2006 at 12:35 PM.
jdc1244 is offline  
post #13 of 13 (permalink) Old 05-07-2005, 02:09 AM
BenzWorld Member
sss11's Avatar
Date registered: Sep 2003
Vehicle: 300 SEL (1989)
Location: Singapore
Posts: 369
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
RE: 300SE fuel pump relay-location??

Mine had a dry joint.Try resoldering the internal joints & keeping it as a spare.

<a href="http://english.wunderground.com/global/stations/48698.html">
<img src="http://banners.wunderground.com/banner/gizmotimetempbig_both/language/english/global/stations/48698.gif"
sss11 is offline  
Sponsored Links

  Mercedes-Benz Forum > General Mercedes-Benz Forums > Off-Topic

Quick Reply

Register Now

In order to be able to post messages on the Mercedes-Benz Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


  • Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
    Thread Tools
    Show Printable Version Show Printable Version
    Email this Page Email this Page
    Display Modes
    Linear Mode Linear Mode

    Similar Threads
    Topic Author Forum Replies Last Post
    90 300SL- Fuel pump relay location?? benzluvr1 R129 SL-Class 3 10-28-2012 05:06 AM
    Location of Fuel Pump Relay for 1990 190 E BobbyGee General Mercedes-Benz 0 03-18-2006 04:31 PM
    Location of Fuel Pump Relay and/or Electrical Diagrams Guest (MBNZ) W126 S,SE,SEC,SEL,SD,SDL Class 6 12-13-2005 09:30 AM
    fuel pump relay location dave850 R/C107 SL/SLC Class 3 06-27-2004 12:52 PM
    300e Wiring question: location of fuel pump relay Guest (MBNZ) W124 E,CE,D,TD Class 3 08-28-2001 10:16 AM

    Posting Rules  
    You may post new threads
    You may 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


    Title goes here

    video goes here
    description goes here. Read Full Story
    For the best viewing experience please update your browser to Google Chrome