My 2005 grand prix cranks but won't start
Turn the key into the on position without actually trying to start it. Do you hear the fuel pump humming for a second or two? You might want to have a helper listen right at the fuel tank opening. If there's no sound your fuel pump has likely failed.
Search Pontiac Grand Prix Questions
Are you a UK consumer? CarGurus now has a discussion forum in the UK.
Pontiac Grand Prix Experts