EVAP canister help

[Louis Baiani]

Hello,

Are you saying that if I have that system I should always notice a pressue when I
open the cap?

Louis

Len Sabatine wrote:

>      Sys should pass a vacuum, pressure test. Supply tube solder joints on
> fuel pickup
>      assembly are often suspect. Sleepy purge valve , gas cap , filler neck
> leak
>      being some other problems. Zero leakage is minimum acceptable.
>      Len
>
> >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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