It would be a relative reading.  If the RPM goes up at all while you are
introducing carb cleaner, propane or soapy water there is a leak there.

Pat

----- Original Message -----
From: "jamie rivers" <jrivers@globalserve.net>
To: "Pat Callaghan" <patcal@qwest.net>
Cc: "Wetwesties Email list" <wetwesties@egroups.com>; " Vanagon mailing
list" <vanagon@gerry.vanagon.com>; <type2@type2.com>
Sent: Sunday, May 13, 2001 8:34 AM
Subject: Re: [T2] Rough idle on 82 westy

> Well,,, what i want to know ... How can you "prove" a vacuum leak..
>
>  install a temp vacuum gauge??
>
> So, with good compression you'd  get a high vac reading at idle, like 20.
>
> what would the reading be with a leak,,, I guess it would depend on the
size of
> the leak??
>
> I know there are other ways of putting a combustible product near suspect
places
> of a leak, to see if the engine revs up..   but I wanted to know if you
can
> prove a vac leak with a vac gauge?
>
> Jamie Rivers
> -
>