When I run my boat at around 55 mph for around 10-15 minutes straight the port motor will start to lose fuel pressure and eventually die out. If I let it sit for about 10 minutes the motor will start right back up and run ok for a while until the fuel pump gets "hot" and then it will start to act up again. I already changed the fuel pump on the front of the motor. I have not changed the fuel pump on the back left side of the motor yet and I am wondering if anyone has ever heard of this problem before..?

Motors are 2003 Mercury 496 Mag H.O.

Any help would be greatly appreciated

check the tank vent,the spiders might have pluged it up ,i have seen it before.

We did that...I was running the boat and it started to die so my buddy reached over and unscrewed the gas cap completely..and it still died out. Someone else suggested to switch the fuel feeds and put the port to the starboard and vice versa to rule out the fuel delivery..? Seems like a good idea.

Thanks