Mercury 4L2Z-9D280-AA Fuel Supply Manifold Assembly

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Begin by relieving the fuel pressure and disconnecting the battery cable to remove the fuel rail assembly. Then, remove the upper intake manifold from the lower intake manifold. Disconnect the fuel feed and return lines from the fuel rail assembly. The fuel injector connectors should be disconnected and so should the fuel rail retaining bolts/studs. Thereafter, lift together the fuel rail and injectors from the lower intake manifold. Rock it side-to-side and remove it from the fuel rail if you want to remove a fuel injector. Replace O-rings and plastic "hats" as necessary. When installing new O-rings, make sure that injector caps are clean and lubricate them before threading into lower intake manifold. Placing the fuel rail over injectors ensuring injectors stay in place using retaining bolts/studs. Perform remaining steps in reverse for re-installation.