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it depends on the manufacter date. 5-3-99 had a fuel regulator with a fuel return, after 5-3-99, no fuel regulator, returnless fuel system. if it is flooding, look at the fuel pressure sensor bolted on before the injection rail, fuel line go's to it and has one vacuum line and one plug in.

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11y ago
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Q: Where is the fuel pressure regulator on a 1999 mercury cougar?
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