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kamie is correct, we are talking 2 different areas here.
Let's keep focused on the original post concerning water in the fuel tank cavity.

The fuel tank cavity is a compartment of its own. Water getting in this area does not get into the foam of the hull. It only gets the foam wet that is around the fuel tanik. The fuel tank compartment is similar to a bow locker except the bow locker has a thru-hull drain where the fuel tank compartment does not.

I agree with Blackduck, the water that gets into the fuel tank compartment mostly comes in through the access cover area on the port side of the boat where the fuel fill and vent lines enter the area.