We pulled the deck and checked the tank as best we could and found 2 of the screws that secure the the send unit had been stripped and the screws had popped out over time. When the boat bounced around a small amount of gas seeped out.

We retapped the hole and secured with new screws.

That seemed to have done the trick. No more heavy gas fumes.

We were out for 2 hours on Lake Michigan today. No gas fumes.

I was lucky it was not the tank. The best deal on a new one was around $500 or so and at least 4 weeks to fabricate.

Thanks for all your help.