Air-cooled and Digijet engines had vacuum-advanced distributors.  The fuel
pressure regulator is also vacuum controlled.  The source for these devices
are the intake manifold.

On Tue, Feb 16, 2016 at 9:00 AM, Ralph Meyermann <ralphmeyermann@gmail.com>
wrote:

> Usually source is somewhere on intake manifold between throttle body and
> cylinder heads, it powers the brake booster and probably a few other
> components. My Diesel has a vacuum pump and I think it only runs the brake
> booster.
> On Feb 16, 2016 10:57 AM, "John Rodgers" <jrodgers113@gmail.com> wrote:
>
> > Couldn't find much on bentley about this. How does the vacuum work.
> Source?
> > Affects what systems? How?
> >
> > Would appreciate any istruction on this!
> >
> > Thanks.
> >
> > John
> >
>