2005 Buick Rainier Fuel Injector

You should lubricate the new injector O-ring seals with clean engine oil, install the new injector O-ring seals on the fuel injector and a new retainer clip on the injector, push the fuel injectors into the fuel rail injector socket with the electrical connector facing outward, connect the fuel injector electrical harness connectors to the fuel injectors and install the fuel rail assembly.

You should remove the fuel rail assembly, disconnect the fuel injector electrical harness connectors from the fuel injectors, remove the fuel injector retainer clips and the fuel injectors from the fuel rail, discard the injector retainer clips and remove the injector O-ring seals from both ends of the injectors.

GM top-engine cleaner is the only injector cleaning agent recommended and under no circumstances should the top engine cleaner be added to the vehicle's fuel tank, as it may damage the fuel pump and other system components. You will need a total of 960 ml (32.4 oz) of cleaning solution and that is 2 tanks of solution for the J 35800-A. Other brands of tools may have a different capacity and would therefore require more or fewer tanks to complete the procedure. You must use all 960 ml (32.4 oz) of the solution to ensure complete injector cleaning.