Chevrolet Trailblazer Service Manual page 318

Fuel rail assembly removal and installation
13. Remove the fuel rail assembly bolts from the cylinder heads.
14. Loosen the fuel rail crossover pipe retainer clip screws.
15. Remove the fuel rail assemblies from the cylinder heads.
16. To avoid system contamination, plug the holes and cap the fittings.
17. Remove and discard the lower o-ring seals from the fuel injectors.