A fuel pressure regulator is a crucial engine component that maintains consistent fuel pressure to the injectors. It ensures the correct air-fuel mixture for optimal performance, efficiency, and to prevent issues like running rich (too much fuel) or lean (too little fuel). It works by controlling fuel flow, often returning excess fuel to the tank. And adjusts pressure based on engine load, using a diaphragm and vacuum or electronic signals. And is common in return-style (older cars) or returnless (newer cars) systems.
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