Fuel starvation problem - Page 2 - Mercedes-Benz Forum
Reply
 
LinkBack Thread Tools Display Modes
post #11 of 15 (permalink) Old Yesterday, 05:03 PM Thread Starter
BenzWorld Junior Member
 
Date registered: Jul 2016
Vehicle: 1982 380sl
Location: kingsport tennessee
Posts: 13
Mentioned: 0 Post(s)
Quoted: 4 Post(s)
(Thread Starter)
Late posting It was the fuel pump shut off relay behind the glove box
charlie58 is offline  
Sponsored Links
Advertisement
 
post #12 of 15 (permalink) Old Yesterday, 07:10 PM
BenzWorld Elite
 
okyoureabeast's Avatar
 
Date registered: Mar 2017
Vehicle: 1984 380SL
Location: North America
Posts: 1,994
Mentioned: 6 Post(s)
Quoted: 671 Post(s)
Quote:
Originally Posted by charlie58 View Post
Late posting It was the fuel pump shut off relay behind the glove box
That's an interesting culprit. I was unaware that the fuel pump relay would cause that type of issue.

Typically it's no start or random failing at speed. Will add this one to the brain.
Weather Man likes this.
okyoureabeast is online now  
post #13 of 15 (permalink) Old Yesterday, 07:57 PM Thread Starter
BenzWorld Junior Member
 
Date registered: Jul 2016
Vehicle: 1982 380sl
Location: kingsport tennessee
Posts: 13
Mentioned: 0 Post(s)
Quoted: 4 Post(s)
(Thread Starter)
I live in East Tennessee and my Indy is a redneck factory trained MB mechanic from 1979.He is great Rick Parnel /Benz Doctors Kingsport TN. He said it was a process of elimination. HE SWAPPED OUT COMPUTER CONTROLS AND OTHER COMPONENTS. Gave me the option of ordering new 1982 unit for $278 and cut out at 5200 rpm or take a used unit from a 1984 that cut out at 5500 rpm. No Brainer.Although he had my car there for over 6weeks my total bill was only $386. He did not work on it full time kind of fitted me in between people who needed their car and people who just wanted their car fixed. 5 Stars for Benz Doctors
charlie58 is offline  
Sponsored Links
Advertisement
 
post #14 of 15 (permalink) Old Yesterday, 11:16 PM
BenzWorld Elite
 
Djenka018's Avatar
 
Date registered: Jan 2005
Vehicle: '80 450SLC Afro RHD Ikonengold
Location: ɹǝpu∩ uʍop 'ʎǝupʎS
Posts: 2,694
Mentioned: 2 Post(s)
Quoted: 131 Post(s)
Quote:
Originally Posted by charlie58 View Post
Late posting It was the fuel pump shut off relay behind the glove box
I was to suggest this... glad you got there earlier

And you used the most precise description of the relay: "fuel pump shut off".

Quote:
Originally Posted by okyoureabeast View Post
That's an interesting culprit. I was unaware that the fuel pump relay would cause that type of issue.

Typically it's no start or random failing at speed. Will add this one to the brain.
It reads the ignition signal from the TSZ or EZL to know if the engine stops therefore to cut off the fuel when required.
It jsut stops sensing the signal at higher frequency (= rpm) and it thinks the engine stopped... only to reengage the fuel pump again as the rpm drop and it starts sensing the ignition again
Weather Man and okyoureabeast like this.
Djenka018 is offline  
post #15 of 15 (permalink) Old Today, 02:49 PM
BenzWorld Elite
 
okyoureabeast's Avatar
 
Date registered: Mar 2017
Vehicle: 1984 380SL
Location: North America
Posts: 1,994
Mentioned: 6 Post(s)
Quoted: 671 Post(s)
Quote:
Originally Posted by Djenka018 View Post
I was to suggest this... glad you got there earlier

And you used the most precise description of the relay: "fuel pump shut off".



It reads the ignition signal from the TSZ or EZL to know if the engine stops therefore to cut off the fuel when required.
It jsut stops sensing the signal at higher frequency (= rpm) and it thinks the engine stopped... only to reengage the fuel pump again as the rpm drop and it starts sensing the ignition again
Crazy! That would have driven me nuts. Thank you for the lesson. Good to know of another failure mode of this wildly critical part!
okyoureabeast is online now  
Sponsored Links
Advertisement
 
Reply

  Mercedes-Benz Forum > Mercedes-Benz Roadster Forums > R/C107 SL/SLC Class

Quick Reply
Message:
Options

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

Password:


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

Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 



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

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