im a new be here i have a impala ss 04 105,000mi an i have a problm pumping gas in to my tank. when i get up in the morning an try to put gas in it, it wont let me. an starts over flowing. but if i drive it around for a min an then try to go put gas in it, i can pump mabe like 10.00 then it over flows again so i stop an wait a min an pump again. my chk light is on so i got it chk an it was e-vac so i dont know if that part of it or not. pls help