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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.
I dont know if you have a replacement for it already or not, BUT
I have a like new aeromotive adjustable fuel pressure regulator i'd be willing to hook you up with for a great price, PM me if you want.
It was leaking, so i figured it was faulty so i bought a Kirban and replaced it, but when i removed it i discovered it was just a pinched 50 cent o-ring .