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The first thing I would check is the float. If the float has a hole in it and is filled with fuel, it cannot shut off the flow from the fuel pump when the bowl is full. If the float is not leaking, it may be some debris under the float needle, which could also cause the overflow.
Be very careful that you don't have the car catch on fire. I would not drive it until you get this sorted out. Good luck.
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Chris
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