I had a similar problem recently, and I probably have the same engine. I have a 2000 315 hp merc. I contacted merc, and they said there have been problems with this recently. They pointed to the increase in the use of ethanol around the country as one of the problems. That did not end up being my problem. The symptoms you listed above lasted for a few weeks, and then all of a sudden, the boat wouldn't start. I did get it to start occassionally, but it would not run real long. I popped in a new fuel pump, and the boat has done great ever since. That being said, I offer this caveat. I have not run the boat in intense heat since changing the pump. Some people told me that if you remove the cover from the fuel pump and shoot it with cold water, this will help to overcome vapor lock. Next time the boat won't start, take off the cover and put your hand against the pump while someone is cranking on the key. If you can't feel the pump working, I'd say your pump is going out on you.
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