Can't put gas into the gas tank . I have a 2001 gmc jimmy and have had alot of trouble puting gas into the tank ,I am only able to put about $2.00 in and then the gas pores back out.

I had this same problem....I had it checked out a few times and got many different answers and spent money for fixes that didn't correct the problem. Finally about the 3rd time in the shop they finally found the problem/solution.

There is a pressure purge valve located near the tank that is supposed to release the pressure in the gas tank when you shut off the engine. My valve was bad, it wasn't releasing the pressure when turning off the car. Since the pressure remained in the tank, it forces any new gas trying to down the filler neck into the tank back out. I have heard that this is a common problem with the Jimmy.

I had this part replaced and now I can pump gas as normal.

Try not pulling the gas trigger so much at first and then squeeze it a bit more. Give some room for the air to come out for the gas to go in. Good luck