Relieve the fuel pressure and disconnect the cable(s) from the negative terminal of the battery. Unless the vehicle has been driven far enough to completely empty the tank, siphoning out the residual fuel before removing the fuel pump is advisable. Raise the vehicle and support it securely on jackstands, then remove the fuel tank. A special fuel line removal tool, available at most auto parts stores, may be required to disconnect the fuel lines from the fuel pump. Use paint or a marking pen to highlight the alignment marks on the fuel pump assembly and the fuel tank. Remove the fuel pump assembly from the fuel tank; for plastic tanks, turn the retaining ring counter-clockwise until loose using a special tool designed for fuel pump removal, or channel locks if the tool is unavailable. For steel tanks, remove the mounting bolts from the fuel pump assembly. Reach into the fuel tank to disconnect the fuel pump latches by squeezing them toward the fuel pump body, push down on the assembly to release it, and carefully lift the fuel pump assembly from the tank, noting the position of the fuel pump and latches. Remove and discard the old seal ring if equipped, then separate the fuel pump from the assembly. Clean the fuel pump mounting flange, the tank mounting surface, and the seal ring groove. Installation is the reverse of removal; apply a thin coat of heavy grease to the new seal ring to hold it in place during assembly, ensuring the fuel pump is aligned properly with the latches on the module inside the fuel tank for a secure snap fit.