Okay my friend is a complete idiot. He has a sunfire(yes i know its in the cavalier forums but you guys know more shit than the sunfire forums)

okay well back to the story well he didn't know why his car wouldn't start this morning but he just called me and told me he knows why.
Guess What
He put diesel fuel into his car instead of unleaded. (what a freaking retard).
Well he wants to know what to do??? Does he just have to drain the tank or is it more serious than that???
Thanks,
Jason