350 Mercruiser Not Re-Starting

All, I'd like to get your thoughts. I've been having some issues with my 2001 240 Sundeck with a Mercruiser 350. Background Info: I did have bad gas at the beginning of the season, that seems to be fixed. I've also put in new sparks, oil filter, fuel filter, and batteries. I had the oil changed during winterization.

I'm able to start the engine and it runs fine at idle and cruising. BUT after I've been out for a bit (maybe 10 mins) and the engine is warmed up, after I turn-off the engine for a while, whether filling-up the tank or sitting in a cove, I CAN'T get it to re-start. It's cranking, but it just doesn't catch. Any ideas?

Thanks in advance.

Check for spark and fuel pressure 1st thing. Hopefully it is a coil, ignition sensor or vapor lock.

I suggest running the bilge blower the entire time the engine is running as well as 5 minutes after shutting down and 5 minutes prior to starting. If you are having vapor lock this may help prevent it.