EVAP canister help

[Louis Baiani]

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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>
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