Designed to work directly with FUELAB's Prodigy fuel pumps to control pump speed, the new FUELAB 529XX Series Electronic Fuel Pressure Regulators reduce heat build-up and vapor lock conditions commonly associated with street and strip use. FUELAB's patented electronic regulator places a restriction valve along the return line which electronically monitors pressure and controls the FUELABL Prodigy Fuel Pump accordingly. If the regulator senses pressure is too high, the pump is signaled to slow down and vice versa. This allows the pump to operate at a reduced speed with low engine output while also providing relatively constant return line flow.