TrailBlazer 4WD L6-4.2L (2007)
Fuel Rail: Service and Repair
Fuel Rail Assembly Replacement
Removal Procedure
Important: An 8-digit identification number is located on the fuel rail. Refer to this model identification number if servicing or part
replacement is required.
1. Relieve the fuel system pressure. Refer to Fuel Pressure Relief.
2. Disconnect the fuel feed pipe (3) from the fuel rail (2).
3. Remove the intake manifold.
4. Before removal, clean the fuel rail assembly and the cylinder head with a spray type engine cleaner, GM X-30A or equivalent, if necessary. Follow
the package instructions. Do not soak the fuel rail in liquid cleaning solvent.
5. Disconnect the fuel injector harness in-line connector (3) from the engine wire harness.
6. Remove the fuel injector harness in-line connector (3) from the rocker cover.
7. Remove the fuel rail attaching bolts (2).
Notice:
* 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, clean the fuel rail with a spray type engine cleaner, GM X-30A or equivalent, if necessary. Follow the
