Sierra 2500 4WD V8-6.6L DSL Turbo (2007)
4. Remove the fuel filter/heater element housing to fuel feed block fuel hoses.
5. Disconnect the engine wiring harness electrical connector (1) from the exhaust gas recirculation (EGR) valve.
6. Disconnect the engine wiring harness electrical connector (1) from the fuel injection fuel rail pressure sensor wiring harness extension electrical
connector.
7. Remove the fuel injection fuel rail pressure sensor wiring harness extension retainer (3) from the bracket.
8. Remove the engine wiring harness bracket bolts and remove the bracket (2).
9. Reposition the engine wiring harness slightly in order to access the front fuel injection fuel feed pipe.
10. Prior to removing the fuel injector pipes, use compressed air to blow any debris from between the injector line and fittings. Wipe the fittings clean
of debris.
11. Spray lithium grease, GM P/N 12346293 or equivalent, between the fuel injector line and fittings to assist in containing any debris during removal.
Notice: DO NOT use compressed air to clean debris from the fuel injector inlet after the fuel line is removed. Using compressed air can allow
debris to enter the fuel injector inlet and damage the fuel injector.
12. Remove the fuel injector pipes.
Installation Procedure
Notice: Ensure proper torquing of the fuel injector line. An under-torqued fuel injector line will not seal properly and an over-torqued fuel injector line
may damage the fuel injector fitting. An improperly sealed or damaged fuel injector line or fuel injector fitting will cause a fuel leak.
