C 1500 Yukon 2WD V8-5.3L VIN Z Flex Fuel (2003)
15. Remove the fuel rail bolts.
16. Remove the fuel rail.
NOTE: 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.
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.
INSPECTION PROCEDURE
1. Inspect the fuel injector lower O-ring seals (5) of each fuel injector (3 ) for damage.
IMPORTANT:The Denso fuel injectors installed on the E85 application will NOT have O-rings and retaining clips serviced separately. Therefore the
fuel injectors will be replaced whenever an O-ring or clip needs to be replaced.
2. Replace the fuel injectors as needed.