Q: How to replace the fuel pressure regulator in a Toyota 4Runner?
A: To start, relieve fuel system pressure and disconnect the negative battery cable. For V6 models, remove the engine cover and Air Filter Box. Then, remove the Fuel Rail and Fuel Injector, followed by fuel pressure regulator mounting bolts to remove the regulator. Replace the old O-ring with a new one. Reverse removal steps for installation, ensuring proper torque for mounting bolts. For V8 models, disconnect the vacuum hose from the regulator and loosen the fuel return hose clamp. Remove bolts securing regulator to fuel rail and replace old O-ring with new one coated in clean engine oil. Follow the reverse order of removal for installation, tightening regulator bolts to the specified torque. Proper torque and careful handling of O-rings are crucial for a successful installation.