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#1
11-14-2005, 06:05 PM
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Engine doesn't shut off after replacing fuel return hose
Never had shut off problems since buying my 240D eight months ago...
It always shut off promptly upon turning the key. Two days ago I replaced the fuel return hose segments, which had been leaking for some time. Right after doing that, the engine just doesn't shut off any longer after removing the key, it just keep running indefinitely. Even pushing down the shut off lever inside the engine compartment just slows down the engine idle, but it doesn't shut it off. To shut it off I've resorted to putting it in first gear, pushing on the brake pedal and slowly lifting the clutch pedal until eventually the engine dies off. What is going on?
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1979 240D, W123, 105K miles, stick, white w/ tan interior. 
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#2
11-14-2005, 06:22 PM
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Most likely you nocked a vacuum line loose. Pop the hood and look around.
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1999 SL500 1969 280SE 2023 Ram 1500 2007 Tiara 3200
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#3
11-14-2005, 06:40 PM
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Ten to one odds that you knocked loose a vacuum connection under the hood. If this is the only vacuum accessory that isn't working, follow the line from the shutoff solenoid on the back of the pump to the firewall, I bet it's freshly cracked or unplugged somewhere.
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'79 300SD W116 '86 190E 2.3-16V W201 '92 300D 2.5 W124 '99 E320 4MATIC S210
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#4
11-14-2005, 07:03 PM
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What they said.
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1982 240D. My name is Michael, and I am an 18 year old binge-drinkin', cigar-smokin', novel-writin', all around unsavory and unnattractive guy. I tell long-winded stories, and I only shave once a week, although I've had to do it every day since I was 16.
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#5
11-15-2005, 08:26 AM
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why would an errant vac hose cause the manual shut off to not work? I'm not familiar with the 240 but still am curious.
reagrds and best of luck solving the prob.
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Rob M Norwich, VT USA 1980 240D Euro delivery 4 speed manual silver/blue ~160K miles
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#6
11-15-2005, 08:28 AM
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Quote:
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Proud owner of .... 1971 280SE W108 1979 300SD W116 1983 300D W123 1975 Ironhead Sportster chopper 1987 GMC 3/4 ton 4X4 Diesel 1989 Honda Civic (Heavily modified) --------------------- Section 609 MVAC Certified --------------------- "He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche
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#7
11-15-2005, 11:41 AM
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9 out of 10 times the linkage is misadjusted causing the STOP lever not to depress fully at the IP. It's a different problem then the vac shutoff not working.
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Adam Lumsden (83) 300D Vice-President of the MBCA International Stars Section
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#8
11-15-2005, 12:48 PM
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manual shutoff
When my vacuum pump failed last year due to a quarter-inch hole in the diaphragm, I used the manual shutoff for a while, and found it wouldn't quite shut off unless the manual idle adjustment knob on the dash was all the way down. If that doesn't solve the problem, I guess I would try adjusting the linkages involved.
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#10
11-16-2005, 03:10 PM
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Quote:
 SUCCESS!!! Upon careful inspection I found a tiny red/green plastic tube was disconnected from the vacuum line. Upon connecting it, the engine now shuts off promptly upon turning the key. What's funny is that this connection is far away from the area where I did my work and it's very unlikely that I might have knocked it off. My guess is that it had been disconnected for a long time... Yet, I hadn't experienced any problems with shutting down the engine until I replaced the fuel return line. Go figure...Thank you all who have contributed! You have been very helpful and I am grateful (and much relieved!) Rino
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1979 240D, W123, 105K miles, stick, white w/ tan interior.
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