The Fuel Pressure Regulator in Toyota Corolla vehicles is required in regard to the electronic fuel injection system to regulate the fuel pressure in the system. It is usually installed on the fuel rail and runs on a spring and diaphragm principle. Through attaching to the engine vacuum as well as to the fuel return line, the regulator controls fuel supply in accordance with the needs of the engine where it is located; thus, the fuel which is not needed when the engine is idling returns to the tank and the fuel supply is limited at the moment the latter is required during the acceleration process. There has been a few generations of Fuel Pressure Regulators that have been incorporated in Toyota Corolla models with both pressure reducing and back-pressure types. For those who require improved performance, upgraded adjustable regulators are supplied whereby tuners can adjust in order to get the exact perfect mix of air and fuel. These regulators are so designed to enable compatibility with different fuel systems in a way that would enable Toyota Corolla vehicles to satisfy various performance requirements.
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