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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.
Yeah, use a flarenut wrench (line wrench) and NOT an open end wrench... your gunna have an even ****tier time if you strip one of these things out. Try a bit of penetrating oil first (make sure u bleed that leg of the system VERY well) but if it still doesnt help, move onto the "smoke wrench"