The verdict is in.
My tank is 40 gallons. I emptied 17 gallons of fluid from the tank. 3 gallons of which was salt water. That would explain the surging. My tank vent is at the extreme stbd quarter of the boat at the transom, just below the rub rail and in front of the bilge pump outlet. I think that between the bilge and the spray from running on plane, I shoved a bunch of bayou water down the vent pipe and voila, problem. There was also a bunch of varnishy goodness in the bottom of the tank that I was able to hoover out. I blew the pickup tube out with compressed air; it was clean. I've already replaced all fuel lines with the good stuff prior to this problem and there is no pickup screen on the pickup tube, nor do I have an anti siphon valve.
My plan is to move the vent line on Friday and run it again on Saturday with a clean tank and see what happens.
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