Whereabouts of Safety Fuel Shutoff Switch? - Mercedes-Benz Forum

LinkBack Thread Tools Display Modes
post #1 of 6 (permalink) Old 07-19-2007, 06:31 AM Thread Starter
BenzWorld Junior Member
Date registered: Jul 2005
Posts: 40
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
(Thread Starter)
Whereabouts of Safety Fuel Shutoff Switch?

re my original posting

1993 SEL600 wont start - again!
I'm at my wits end with this car now! went to start car up today, motor turns over without problems or strange noises but engine just wont fire up (not even trying to fire up). Last time this happenned was about a couple of months ago and car miraculously "fixed" itself after being left alone for a week. Since then car has run fine, used daily running 200 - 300 miles per week, starting first time, smooth to drive and with good (18mpg) economy. In last 2 years both ETA's replaced, engine and air mass harness replaced, new battery 2 months ago yet still this occasional problem persists (it's happenned about 10 times in all over the last couple of years). HAS ANYONE ANY IDEA WHAT COULD BE WRONG WITH THIS CAR? all reply's appreciated. TIA.

It has now been established that it is the Safety Fuel Shutoff Switch that is the cause of the problem. Does anyone know whether this is a part of a module or a seperate part and where it is located?

terence is offline  
Sponsored Links
post #2 of 6 (permalink) Old 07-19-2007, 10:58 AM
Lifetime Premium Member
Date registered: Mar 2004
Vehicle: 1997 S600 (sold)
Location: San Diego
Posts: 4,660
Mentioned: 0 Post(s)
Quoted: 14 Post(s)
Lifetime Premium Member
Sorry, I can't answer your question directly, but I would like to hear how your diagnostics determined that the problem was a fuel safety shut-off switch. Are you certain that the car has one? I've not heard of one on my car, but it is a different fuel injection system.

This info could be educational to others.

Brett San Diego is offline  
post #3 of 6 (permalink) Old 07-19-2007, 02:04 PM
BenzWorld Elite
Date registered: Dec 2002
Vehicle: 92 500SEL to 01 E320T and others
Location: Florida
Posts: 3,886
Mentioned: 0 Post(s)
Quoted: 3 Post(s)
I have only heard of a ful pump pressure switch, when you turn the key the pumps come on, but shut off if the car does not start within 10 seconds or so. Has anyone checked the pressure in the fuel rail, and to see if there is spark. also the crank shaft position sensor!
Peter Guenther is offline  
post #4 of 6 (permalink) Old 07-23-2007, 02:58 AM Thread Starter
BenzWorld Junior Member
Date registered: Jul 2005
Posts: 40
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
(Thread Starter)
My local MB specialist had car on his diagnostic computer and that stated Safety Fuel Shutoff Switch as faulty. He then cleared faults and this item came back as fault again. Sorry I dont know which diag equipment he uses. Also, his system doesnt tell him the location of that component, or whether its a single component or part of a module, hence my original question.
terence is offline  
post #5 of 6 (permalink) Old 07-23-2007, 03:07 PM
BenzWorld Extremist
Date registered: Feb 2003
Vehicle: 600SEL
Location: NY
Posts: 1,083
Mentioned: 0 Post(s)
Quoted: 84 Post(s)
There is a safety microswitch in the driver side throttle actuator. Did you have you engine wiring replaced? On 600SEL you need to replace main harness, Air mass sensors harness, and at least check both throttle actuators wiring. I have 92 model and my TA are fine, but engine main harness and AM harness had to be replaced.
Here is a page with description of the safety fuel cutoff.
Attached Files
File Type: pdf Safety fuel cutoff.pdf (15.1 KB, 2157 views)
myarmar is offline  
post #6 of 6 (permalink) Old 07-24-2007, 03:08 AM
BenzWorld Member
AlexanderZwo's Avatar
Date registered: May 2007
Vehicle: Mercedes 300 SE (W140)
Location: West-Germany, near Cologne
Posts: 356
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Great and interesting information...tks! New one for the "hidden talents" thread...

Best regards

300 SE, EZ 10/91, 97.000 km, Originalzustand, 4-Gang-Automatik, blau/schwarz, Leder schwarz, Sitzheizung, Klimaautomatik, ASD, Servoschließung, Schiebedach, Parameterlenkung, Becker Grand Prix, Mittelarmlehne mit Box, Wurzelholz, Colorverglasung, Einbruch- und Diebstahlwarnanlage o.I., 8-Loch LMs, Winterräder mit Originalabdeckung, original Feuerlöscher, abnehmbare Anhängerkupplung, komplette Dokumentation
AlexanderZwo is offline  
Sponsored Links

  Mercedes-Benz Forum > Mercedes-Benz Sedan Forums > W140 S-Class

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:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

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
fuel shutoff valve skitzy.sht W201 190-Class 23 03-21-2007 03:18 AM
Neutral safety switch cbx79 W124 E,CE,D,TD Class 0 04-19-2006 12:40 PM
99 E300 turbodiesel fuel leak, electrohydraulic shutoff box bhowell_10 W210 E-Class 3 10-01-2005 02:46 PM
fuel shutoff solenoid ggenovez Vintage Mercedes-Benz 2 07-16-2005 01:27 AM
560 Fuel Shutoff?? jcantor W126 S,SE,SEC,SEL,SD,SDL Class 0 09-18-2002 04:14 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