Ford Ranger Maintaince And Repair Manual page 301

Disconnect the fuel supply and return lines from the injector fuel rail
Label all of the electrical connections on the lower intake manifold ...
11. Disconnect the fuel supply and return lines from the injector fuel rail.
12. Label and disconnect all of the electrical connections on the lower manifold assembly.
13. Remove the valve covers.
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... then disconnect them. Next, remove the valve covers
REMOVAL & INSTALLATION