Trouble filling gas tank

I just had the fuel pump replaced 1 week ago. This problem started the day before I had the fuel pump replaced.
The shop is saying they will have to go to the junk yard and get the hose that connects to the gas tank or something. the mechanic said that there is a vent hose that goes into a unloading pump filter to catch all the vapors from the tank. The last time I filled it up, I over filled it and got gas into this charcoal filter and the ventilation hose that attaches to that. This made it so that when I fill the tank it can only displace the air in the fill pipe to the tank. The fuel eventually makes its way down to the tank, but takes a few minutes. Maybe all of you can try something like that. He changed your pump, but even you said that this problem started before the pump was replaced.
I found this for GMC. It might help.
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Heres an exert from one of the TSB's about filling the gas tank.(why to have the motor off when filling it)
Filling of the fuel tank can not be completed as the evap vent valve will be closed and the fuel dispenser nozzle will sense the pressure buildup and shut the pump handle off. No parts should be replaced, there is nothing wrong sliding vane pump, to keep from encountering this problem, it is imperative that all customers and dealerships personnel. If this condition is encountered, turn off the ignition for 1 minute. this will allow the pcm to set the evap to open postition.
I took this exert from GM Techline but Mitchell is almost word from word about it.
hey, theres ONLY 556 TSB's on that vehicle! LOL
The TSB the other guy talks about is actually not the pickup tube, but if you get an evap code, its most likely the 4 wire plug that plugs into the fuel pump assembly. It is known for burning and melting a hole in the plastic piece and then the tank cant hold vacuum which causes the evap code. 1492 I think the code was.
So when you do have to change that fuel pump, be sure to get the new plug also!
2 years ago
Have an 06 CTS 32000m and noticed my emission control/engine light came on after the outside temp just rose to 97degrees. checked my gas cap and it hadn't been tightened fully 3 days earlier tatsuno pump of a tank fill at pump. Tightened it then next day light wqas still on and went to the station to put a cpl gallons premium in and couldn't get her to take barely a gallon. None would go in. The gas station attendant said my tanks full and my gauge is broken, but I know I havent put gas in it all week. And between the gas station and work I went from a x quarter tank to an 1/8 of a tank. The gauge is fine, something must be blocking the line to the tank. hence I Googled it and found this forum. So now do I attempt to spear whatever it is out and risk debris contaminating my tank? The repair shop will probably do the same thing anyways and charged me a fortune.