Won't start after running fine all day on the lake.
My 1988 V6 merc 4.3 carb'd motor (140 hrs) takes everything we give 'er all day on the water, and when comes time to head to ramp recently - starts and idle fine, but as soon as you give the throttle a push it dies - no sputter, nothing. After we sit for a little while it seems flooded, almost turns over but never does, until today. I pulled off the spark arrestor and the choke was wide open - It kinda took a tug, but when I flipped it mostly closed - the motor started and we idled in gear to ramp.
Last week I pulled some gas out of the tank and found some separation, drained it and replaced fuel/water filer. Put in fresh high octane today and still died at acceleration on the water. Thanks for suggestions.