EVAP canister help

[ae2598 at wayne.edu]

I briefly had an 84 T/A with a carbureted 305, and noticed no pressure
equalization in either direction when I opened the cap.  This was far from
a perfect example of a T/A though, the evap can may not have even been
connected..


 On Wed, 20 Jun 2001, romans, mark wrote:

> Anybody have an 84 that can answer that?
> 
> ----- Original Message -----
> From: "Louis Baiani" <nepti at nbnet.nb.ca>
> To: <gmecm at diy-efi.org>
> Sent: Wednesday, June 20, 2001 8:43 PM
> Subject: Re: EVAP canister help
> 
> 
> > Would an 84 have alot of pressure?
> >
> > Louis
> >
> > "romans, mark" wrote:
> >
> > > My 89 vet has pressure.  Every GM car I have ever looked at (Late model)
> > > has pressure.
> > > Mark
> > > ----- Original Message -----
> > > From: "Marteney, Steven J." <smarteney at xlvision.com>
> > > To: <gmecm at diy-efi.org>
> > > Sent: Wednesday, June 20, 2001 1:08 PM
> > > Subject: EVAP canister help
> > >
> > > > My last two gas station visits have shown that when I remove the gas
> cap
> > > > from my 89 Formula 350, '165 absolutely NO "sucking" sound is made.
> It
> > > has
> > > > done it before but it was only a quick fizz.  Does the tank run under
> a
> > > > vacuum, therefore the sucking sounds when you crack the cap?  Does it
> take
> > > > time for this condition to develop?  (In other words, start car, quick
> > > drive
> > > > to gas station, shut-off, typically no suck sound?)  Likely a bad gas
> cap?
> > > > Bad vac line?  Bad canister?
> > > >
> > > > I know my 87 T/A 305CCC was quite obnoxious when the gas cap was
> removed.
> > > > I'm wondering if this is the cause of my laxluster gas mileage even
> BEFORE
> > > > the motor was rebuilt.  Any ideas on how to test?
> > > >
> > > > Steve
> > >
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