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There might be a problem with the fuel pressure. When the vehicle is shut off after driven for a while, the fuel pressure create a vapor lock in the fuel line. Therefore, insufficient fuel are going into the fuel injectors while you restart. Also, it check for any TSB from Ford to see of this a common problem for this vehicle. Good Luck.

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Q: Why won't this 1991 Mercury Sable restart after engine is warm from driving and won't start again until parked one to two hours for cooling?
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