EVAP canister help

[ae2598 at wayne.edu]

I had always thought that vacuum in the tank wasn't a good thing.  Isn't
it possible to collapse the tank if there isn't much gas in it?

On Wed, 20 Jun 2001, Marteney, Steven J. wrote:

> 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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