Sierra 1500 2WD V8-5.3L VIN Z Flex Fuel (2006)
13. Disconnect the fuel feed and return pipes (1, 2) from the fuel rail.
14. Disconnect the fuel pressure regulator vacuum line.
15. Remove the fuel rail bolts.
16. Remove the fuel rail.
NOTE:
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Remove the fuel rail assembly carefully in order to prevent damage to the injector electrical connector terminals and the injector spray tips.
Support the fuel rail after the fuel rail is removed in order to avoid damaging the fuel rail components.
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Cap the fittings and plug the holes when servicing the fuel system in order to prevent dirt and other contaminants from entering open pipes and
passages.
IMPORTANT: Before removal, if necessary, clean the fuel rail assembly with a spray type engine cleaner, use GM X-30A or equivalent. Follow the
package instructions. Do not soak fuel rail assembly in any liquid cleaning solvents.
17. Remove the fuel injector lower O-ring seal (4) from each fuel injector, if necessary.
18. Discard the O-ring seal.
INSTALLATION PROCEDURE
1. Lubricate the NEW fuel injector lower O-ring seals (4) with clean engine oil.
