Don't think it is a vacuum issue, but don't know for sure. My vacuum issues slow the shut off process, but don't impact my starting or driving (no stumbling or stalling) - these sound more like fuel delivery issues.
--- In diesel_mercedes@yahoogroups.com, Roland Hyatt <wrolandhyattjr@...> wrote:
>
> My 1981 240D standard has been giving ne fits with a stumbling and
> stalling problem - as well as what I thought was a brake booster gone
> bad. WRONG! At least I now think the problem is a vacuum leak. My
> pump puts out about 18 inches of vacuum, which is about right at 4000
> feet elevation. I have looked for a couple of years for a vacuum
> diagram for my specific car. No luck anywhere. Anyone out there with
> help??
>
> I think that I have about 10 inches with everything hooked up. I think
> the vacuum goes so low that the fuel shutoff starts to shut down the
> engine and it starts to stumble. I have a Mityvac and so can test
> stuff. The problem is not knowing where anything goes. There is a
> green/yellow (I think) line into the "Tee" off the main line from pump
> to the brake booster. I has been broken off and the "Tee plugged. I
> really need a vacuum diagram in order to track the leak. Somebody help?
>
> Roland Hyatt
> 1981 240D stick 210K+
> 1984 300SD 190K
> 1980 240D auto 250K)
> 1983 240D auto inop
> 1983 300SD inop
>
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