My check engine light came on because of an evap vent code. It's the vent on the gas tank. When I try to put gas in it vents out and shuts the nozzle off. Is this a pretty easy fix? I know some vehicles they are right out in the open. Dealer said he would fix it but I have to leave the Tahoe there for a full day. They won't provide a different car and I don't have another I can drive so I have to fix it