[Desert Dan]

Bummer I have never heard of the vent thing on the tank.

The time you were "under water "was part of the problem. How much gas was in your tank at the time?

Also if the gas tank was warmer than the water temp it may have sucked water in through that vent. Tha can happen when your diff goes under water.

Did they flush the rear diff as well?

Maybe I should always carry a can of fuel system water remover. It mixes with small smmounts of water that can then be burned in the engine.