The fuel pressure regulator maintains a constant, optimal pressure in the fuel rail relative to intake manifold pressure, ensuring the correct amount of fuel is delivered by the injectors. A failing regulator causes drivability issues like hesitation, rough idle, poor fuel economy, or black smoke from rich mixtures. Our fuel pressure regulators are calibrated to exact OEM specifications. They provide precise pressure control across the entire engine operating range, which is fundamental for achieving correct air-fuel ratios, smooth power delivery, and efficient engine performance in both port and direct injection systems.