[Spits] Fuel tank not breathing "out"

[030845 at charter.net]

I have a 78 1500.  Discovered my tank was not venting when it developed contraction expansion metal fatigue pin hole leaks. Long story short: problem was incorrectly installed vapor canister and line. Line was full gasoline. 
------Original Message------
From: Ryan
Sender: spitfires-bounces at autox.team.net
To: Spitlist
Subject: [Spits] Fuel tank not breathing "out"
Sent: Jul 16, 2011 10:11 AM

So a few weeks ago, I was filling up the gas tank manually(ie not at a 
gas pump). With a funnel in, I was going slowly & taking a pause every 
quart or so. Every 3-4 minutes it "gushed back up" like a geyser.

I'm starting to think this is also why I was having idling & sputtering 
problems when I was trying to drive on a super-hot & humid weekend about 
a week ago.

So how can one check to see if the fuel tank is breathing "out" 
properly, ie air going in when fuel is going out? This fuel tank is new, 
but not sure about if the vapor collection canister is doing its job. 
This is a '79 with the 2 carbon canisters.
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