How do you install fuel pressure regulator on Pontiac Fiero?

To install a fuel pressure regulator on a Pontiac Fiero, first ensure the engine is cool and disconnect the negative battery terminal. Next, relieve the fuel system pressure by removing the fuel pump relay and starting the engine until it stalls. Remove the old regulator by disconnecting the fuel lines and unscrewing it from the intake manifold or fuel rail. Finally, install the new regulator, reconnect the fuel lines, and reattach the battery terminal, ensuring there are no leaks before starting the engine.