I think your problem is that the engine is gummed up from leftover fuel from 8 years ago. Can you turn the motor over easily? If you cant, A: it is flooded as csb said, or B: you need to clean all the gunk out of your engine. Either way, you should disassemble your engine to check that everything is in running order, no broken or over worn parts. You could probably find some good videos on Youtube related to gunked up engines, or even on this very forum. Just clean it up and you should be good.