carb seems to be giving out at high speeds

[kevdon]

Thank you all in advance for taking your time out to help me solve this issue. I have an 85 v that is powered by a 4cyl mercruser 170. the last 2 times out the boat has tried to quit running when i got up to about 15 knots.It starts right back up and runs fine at a lower speed.Whats got me is after it happened initially I thought I was low on fuel and the plane of accelerating was causing me to not get proper fuel.But tonite when we went out I put in 15 gallons of gas and a bottle of fuel injection cleaner.Boat ran fine at all speeds for 1st hour than same probs occured.I had new carb installed last season and have had no previous problem until now.I have mercruiser repair manual and it suggests running a few tests that require pressure gauges and such.I am hopin for an easy fix.Could the fuel filter be the reason even know it runs fine at lower speeds and starts up on a dime.I am wide open for feedback.Thanks all !!