On an average 1980 300D how long does it take to cut off when the key is turned off? Is it as fast as an gas car?

it should be, if not, you've got a vacuum leak!

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1980 500SE/AMG Euro
1981 500SEL Euro
1982 380SEL
1983 300TD
1983 500SEC/AMG Euro
1984 500SEC
1984 300TD Euro
1986 190E 2.3-16
1986 190E 2.3
1987 300D
1997 C36 AMG
2003 C320T 4matic

past: 1969 280SE 4.5 | 1978 240D | 1978 300D | 1981 300SD | 1981 300SD | 1982 300CD | 1983 300CD | 1983 300SD | 1983 380SEC | 1984 300D | 1984 300D | 1984 300TD | 1984 500SEL | 1984 300SD | 1985 300D | 1986 300E | 1986 560SEL | 1986 560SEL/Carat | 1987 560SEC | 1991 300D 2.5 | 2006 R350

Should be a 1/2sec or less.

I have had the same probs with my mb lately and know it's a vac leak but haven't been able to figure out exactly where. Looking through the records of the previous owner they had the same problem twice and both times it was a vac leak in one of the door locks. If you lock your doors before you shut down and it cuts off faster or at all then supposedly it's leaking from one of the door locks???? my 300 td won't shut down at all unless i lock the door a few minutes before shutting down.

That probably means the leak is in the "unlock" portion of the door lock system (yellow lines with green stripes). When the doors are locked that portion of the system is vented through the "master switch" in the driver's door. When the doors are unlocked, it is part of the vacuum pressure boundary.

Thanx for the info on the door lock syst. I will reply once i track it down. I assume which ever door lock is not ingaging or dissingaging would be the one with the suspected leak??

Our '83 does just about instantly(it failed before though), but my car has always taken 1-2 seconds, for over three years. Hasn't failed yet.

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-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)

Sometimes it's not the easy, if it's a slow leak the door may still lock. If you do have one that's not working, start by looking at that one.