Hello, wondering if anyone can help me as im now stuck at work.

Went to start the s1, and it run for about 3 secs, then just died out. now, whenever i crank it, it runs for about 2 secs, then dies out completely, even with my foot flat on the floor. Its sucking air, and there is no smell of petrol.
The fuel pump is priming, and i have half tank of fuel, so im pretty sure its not them. Any quick help would be good.
Cheers
Mike