These BluePrint Engines carbureted bypass regulators are excellent for pairing with high flow electric fuel pumps, where a return style regulator is preferred to a dead-head style. Many electric fuel pumps put out excessive pressure and volume, and this regulator allows that excess fuel to recirculate to the fuel tank. They deliver consistent volume and perfect pressure to your carburetor, while preventing cavitation and excess heat. Great match for a BPP1300 fuel pump.