EVAP canister help

[romans, mark]

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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