Engine Flooded w/ Gas!?!?!?

[K-Driz]

Hey everyone, went out to the lake today for about the 10th time this year and had a little problem with my engine flooding with fuel. I have a 1999 25hp Mercury 2-stroke engine. Here is what happened. I started the engine right up at the ramp and let it warm up a couple minutes. After that, drove down the lake for about 10 minutes, not at full throttle, but close. Shut the engine down, dumped in a fish attractor and tried to start the engine again but no luck! The engine turned over, but I instantly picked up a strong fuel scent to see a little bit of a gas slick near the engine. I tried starting it for about 2 minutes with the key while choking the engine and still no luck. Tried pull starting it for another minute or so, and nothing. So I fished for about 30 minutes toward the ramp, and started the engine right up again. Drove back to the ramp to pick up another fish attractor, shut the engine down, and had the same problem starting the engine again. Let it sit for a while again and it started right up. This is the first time in the 9 years of this engine's existence that it has had any problems. Has anyone had a similar experience with a 2-cycle engine??? Can anyone give me advice on what the problem might be and how to fix this problem???? Thanks in advance for the help everyone!