ok so this morning my mom went to start her suburban its a 2003 z71, and it wouldn't start. turns out her tank was dry. i thought on the newer vehicles you could not syphon from the tank? and her tank didn't have any holes in it from were they could poke a hole. i guess keep your eyes out, i want to get locking gas caps but GM said you can't, they don't hold pressure and cause the SES light to come on.