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

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Old 07-19-2007, 06:31 AM   #1 (permalink)
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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.
Terence

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?

TIA.
Terence.
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Old 07-19-2007, 10:58 AM   #2 (permalink)
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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
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Old 07-19-2007, 02:04 PM   #3 (permalink)
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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!
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Old 07-23-2007, 02:58 AM   #4 (permalink)
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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.
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Old 07-23-2007, 03:07 PM   #5 (permalink)
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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.
Mike
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File Type: pdf Safety fuel cutoff.pdf (15.1 KB, 840 views)
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Old 07-24-2007, 03:08 AM   #6 (permalink)
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Great and interesting information...tks! New one for the "hidden talents" thread...

Best regards
Hubert
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