gas tank on 2001 Chevrolet Tahoe

i am having troubles with my gas tank getting sucked up in

Asked by for the 2001 Chevrolet Tahoe
This sounds like the evaporative system vent may be plugged. I'm not sure where it is, but I would have someone look into that part of the fuel system. Make sure the charcoal canister is OK as well, these can come apart and plug up the evap system lines.