Fuel Rail: Service and Repair
FUEL RAIL ASSEMBLY REPLACEMENTREMOVAL PROCEDURE
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.
1. Relieve the fuel system pressure. Refer to Fuel Pressure Relief Procedure.
2. Clean the fuel rail assembly 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.
3. Disconnect the fuel feed and return pipes (4,5) from the fuel rail. Refer to Quick Connect Fitting(s) Service (Metal Collar).
4. Disconnect the fuel pressure regulator vacuum hose (1).
5. Disconnect the fuel injector electrical connectors (1) from each fuel injector.
6. Release the 4 snap-lock tabs on the fuel rail assembly by pushing toward the camshaft covers and lifting.
7. Remove the fuel rail (1).
8. Remove the injector lower O-ring seal from the spray tip end of each injector.
9. Discard the O-ring seals.
INSTALLATION PROCEDURE
NOTE:
^ Use care when servicing the fuel system components, especially the fuel injector electrical connectors, the fuel injector tips, and the injector O-rings. Plug the inlet and the outlet ports of the fuel rail in order to prevent contamination.
^ Do not use compressed air to clean the fuel rail assembly as this may damage the fuel rail components.
^ Do not immerse the fuel rail assembly in a solvent bath in order to prevent damage to the fuel rail assembly.
1. Lubricate the new lower injector O-ring seals with clean engine oil.
2. Install the new O-ring seals on the spray tip end of each injector.
3. Install the fuel rail assembly (1) onto the intake manifold. A snap will be heard when the injectors are properly seated.
4. Connect the fuel injector electrical connectors (1) to each fuel injector.
5. Connect the fuel pressure regulator vacuum hose (1).
6. Connect the fuel feed and return pipes (4,5) to the fuel rail. Refer to Quick Connect Fitting(s) Service (Metal Collar).
7. Connect the negative battery cable.
8. Inspect for fuel leaks.
8.1. Turn the ignition ON for 2 seconds.
8.2. Turn the ignition OFF for 10 seconds.
8.3. Turn the ignition ON.
8.4. Inspect for leaks.
9. Install the fuel injector sight shield.