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5.0L (1979-1995) MustangTechnical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
the ecm grounds the windings of the fp relay to start fp operation, could be a bad relay , but you need to see if the ecm is what is causing it to be commanded on ..if so , could be a bad ecm