General Motors — Four attaching screws for fuel rail.

A General Motors service procedure — check it applies to your exact model before use.

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Procedure

1. 10. Fuel rails as an assembly with injectors.
2. 11. Injectors from rails, follow procedure for injector removal
3. outlined in this section.
4. 12. Retaining screws for fuel rail jumper line.
5. 13. Twist and remove jumper line from rail.

Source: manual:5.7L-MEFI-5-Service-Manual.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.