Ford Ranger Maintaince And Repair Manual page 636

HOW TO USE THIS BOOK
To remove the fuel pressure regulator, first remove the vacuum line from the regulator ...
... then loosen the fuel return line fitting ...
... and disconnect it from the regulator
3. If necessary, disconnect the fuel return line from the regulator.
Some engines use two standard hex head bolts to retain the regulator instead of the Allen® head screws.
636 REMOVAL & INSTALLATION