i recently bought a '78 280z for 500 bucks it wasn't running when i got it the guy i bought it from told me it had been sitting for about 4 years and the motor was rebuilt about a year before that. anyways it wasn't getting any fuel to the motor. i found the fuel line was rusted solid and the lines going in and out the tank were clogged i ran a new line replaced the fuel filter and pump and dropped the tank, blew the tank lines out with air and she runs.... i drove it around the block a couple of times the last few weeks but the first time i drove it for more than about 10 minutes it was running fine and then it suddenly died, i tried to restart it and it ran for about 10 seconds at about 450 rpms and blew a cloud of dark smoke before dying. i figured i'd blown the motor or something but the next day it started up fine and idled good i am confused. i read about the gas tank demon and i'm leaning toward that because of the other fuel issues:stupid: just wanted some input from someone who knows more about Z's than i do