Perry VP40SG Pump Regulator Gas/SmokePERRY REGULATING PUMP The Regulating Pump ensures consistent fuel flow to 2 stroke engines regardless of altitude, tank position, or fuel level They improve plug life and fuel economy. Works with any engine that has good mid range. Requires tapping of the engine's crankcase. The SG Pump, designed for gas engines, can be used to pump smoke fuels (such as diesel) into the engine's exhaust system. * Regulating pumps are generally used in most 2 stroke