Kia 353402G300 Pipe-Delivery

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We recommend replacing all injector O-rings even when only one injector O-ring or seal is leaking. On most fuel rails, you have to remove the entire assembly anyway, so replace all of the O-rings/seals to avoid having to remove the fuel rail later. First, relieve the fuel pressure. Then, disconnect the cable from the negative battery terminal. Remove the engine cover, if equipped, and the air intake duct. On V6 models, remove the upper intake manifold. Disconnect the electrical connectors from the fuel injectors, unbolt the harness and set the injector harness aside. Remove the fuel rail mounting bolts, the fuel rail and the fuel injectors as a single assembly. Remove the fuel injectors from the fuel rail. If you intend to re-use the same injectors, replace the grommets and O-rings. Installation is the reverse of removal. Be sure to use new injector O-rings and tighten the fuel rail mounting bolts to the torque.

Depressurize the fuel and disconnect the battery. Remove the engine cover, air intake duct, and filter housing. Remove the upper intake manifold. Disconnect the high-pressure fuel pipe and line from the fuel rail. Disconnect the electrical connectors, then take out the rail bolts, retaining clips, and injectors. Replace the seals, grommets, and O-rings. Remove the old Teflon sealing ring and upper O-ring from each injector. Clean the seal groove and injector shaft. Install a new Teflon seal. Lubricate and install a new upper O-ring. Clean injector bores and insert injectors into the fuel rail. Install new retaining clips. Install injectors and fuel rail assembly on the cylinder head. Tighten new fuel rail bolts.

First, relieve the fuel pressure and disconnect the cable from the negative terminal of the battery. Then, disconnect the Positive Crankcase Ventilation (PCV) valve from the valve cover, and disconnect the PCV hose from the intake manifold. Set them aside.