* Fuel flow: The fuel pressure regulator also controls the flow of fuel to the engine's fuel injectors. This is important because the fuel flow must be maintained within a certain range in order for the engine to run properly. If the fuel flow is too low, the engine will not get enough fuel and will run lean. If the fuel flow is too high, the engine will get too much fuel and will run rich.
* Fuel return: The fuel pressure regulator also controls the return of fuel to the fuel tank. This is important because the fuel return line allows the excess fuel that is not used by the engine to be returned to the fuel tank. This is important because it helps to prevent the engine from running out of fuel.
