Hello I have a 2013 Tahoe that will only allow me to put in 1 to maybe 2 gallons at a time. i was informed by my local machanic that it will be February before they can get to it or even get the parts. I am wondering if there are any quick fixes to make it accept gas.

 

the fault is usually a block vent line. the tank must vent out to the evap cannister out a evap cannister vent solenoid out to a vent filter. any blockages in this path will cause a hard fill. If the check engine light is on have the codes read and post them here.
common fault is a stuck closed vent solenoid.

never heard of a shop booking one month and a half in advance. Probably a tech shortage. Who can wait that long; find another shop.