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I had a truck that did this exact thing one time, apparently at some point, previous to my buying it, someone had "Topped off" the tank and in doing so raw fuel traveled down the vapor return line into the vapor canister and caused it to plug up or at least become restrictive enough so that gas fumes when filling the tank had no choice but to escape through the filler neck which the pump would interpret as a full tank and shut off the nozzle.
My "fix" was to detach the return line from the canister and let the vapor just escape into the air instead of being filtered through the charcoal of the canister, I never had the problem filling the tank after that....
I will caution you that filling the tank after this can result in some leakage of raw gas so I never fueled past about 3/4 of a tank. Not sure how this will translate to an Impala but I would almost bet you are having a similar problem. Something to look into.
 

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Thank you for replying. It seems to be a common problem with these impalas bit no real answer. I will look into doing this. Unfortunately I have replaced the canister and it did not change anything. I would think that by taking it off and adding a new one it would have released this trapped gas or whatever.
Yeah you're not wrong. If you have replaced the canister with a new one that shouldn't be the problem. For clarification, it isn't necessarily "trapped gas" but it acts more like a plugged line. gas vapor during filling needs a way to exit that isn't by passing straight past the nozzle, normally it travels through a bypass that exits the neck of the tank prior to reaching the depth the nozzle usually reaches, it this line is plugged or otherwise impassable by the fumes they have no other exit so cause this issue.
I'm not sure how accessible the canister is but if you remove the line and with the fuel cap off you should be able to blow air through that hose into the neck of the tank, might need a buddy to listen at the fill neck, if you can't blow through it, or they can't hear anything, that line is likely the culprit, possibly crimped or collapsed or something...
 
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