To remove the fuel tank filler neck cap and relieve pressure inside the fuel tank, as well as relieve fuel system pressure. Disconnect the cable from the negative terminal of the battery. Remove the air intake duct and air box resonator. Disconnect the fuel supply line from the fuel rail. Label and disconnect any vacuum hoses interfering with fuel rail removal. Disconnect electrical connectors from information sensors on the throttle body and set aside wiring harnesses. Disconnect fuel injector electrical connectors and set aside injector wiring harness. Remove ignition coils from the engine. Clean debris around the injectors and remove fuel rail mounting nuts/bolts. Gently rock the fuel rail and injectors to loosen and remove as an assembly. Do not separate left and right fuel rails. Remove injectors from fuel rail and discard O-rings. Coat new O-rings with clean engine oil and install on injectors. Insert injectors into corresponding bore in fuel rail and install retaining clip. Clean injector bores on intake manifold. Guide injectors/fuel rail assembly into injector bores on intake manifold and tighten mounting nuts/bolts. Reverse removal steps for installation. After installation, activate
Fuel Pump without starting engine to build up fuel pressure and check for leaks. For HEMI engine, use special fuel line disconnection tool to disconnect metal collar fitting connecting fuel supply line to fuel rail.