paulr1076 , You did change the evap. canister already so I assume this would include checking the lines for flow and not pinched while you were at it. Along with the large gas filler neck tube are a couple other metal or rubber tubes connected, one of the other small tube vent the air also when filling tank, perhaps remove the gas filler tube assy, and check for blockage, you can run a wire down or use compressed air to blow out. Also on some models there may be a small one way valve attached that may be clogged or if it ever been replaced may have been installed backwards. I had experienced this problem in a truck i had, temporarily I just did not stick the gas pump nozzle in too far(1/2 way), this allowed air to escape a bit better. Good luck. I hope this helped you out, if so let me know by pressing the helpful button.
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