Patrick, I am assuming it is a gas engine? I take it, you are saying the engine cranks but does not start. Next time it does not start right up, give it a squirt of starting fluid or gas directly in the throttle body. If it fires right up then it is definitely a fuel issue. Check for pinched/collapsed fuel lines, fuel filter clogged and if all looks good it is probably a faulty pump. I have had new pumps faulty out of the box, especially the cheap ones. If you have access to a fuel pressure gage you can check the pump for appropriate pressure. Also check to see if you are getting any trouble codes which can aide in diagnosing. Good luck.
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