Mix the flour, 1 1/2 cups sugar, baking soda, and salt in a large mixing bowl.
Add the pineapple with its juice, the vanilla, and beat to combine.
Pour into a greased 9x13 pan and bake at 350 degrees for 30 minutes.
Just before the cake comes out of the oven, mix the sugar, evaporated milk, and butter in a sauce pan and bring to a boil for 2 minutes, stirring frequently.
Pour the sauce over the hot cake when it comes out of the oven, pouring slowly, allowing the sauce to soak into the cake.
Serve warm or at room temperature with whipped cream and/ or vanilla ice cream.
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