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The fuel pressure regulator is often overlooked, but a very critical component in a vehicle’s fuel system. Without a reliable and consistent fuel pressure, your ECU has no way of knowing how much fuel it is injecting into each cylinder. Most conventional fuel pressure regulators use a bladder-type design. Although the bladder-type design is cost-effective and reacts to disturbances quickly, those bladders often lead to significant pressure fluctuations, which are manifested as a bouncing needle on your pressure gauge.