EVAP canister help

[Len Sabatine]

     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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