Feature: This electronic fuel pumps are great as stand-alone or booster pumps, are self-priming, and have a simple 2-wire design. They work with 12 V negative-ground systems and include mounting hardware. Designed to provide efficient fuel transfer Suitable for 12 volt negative system ground Universal design for most domestic 4, 6, and 8 cylinder carburetor applications. Easy to install Ideal as a fuel transfer pump Dependable construction Quiet operation Self priming For Diesel Fuel only. Gasoline only Pumps 4 to 7 PSI Flow rate is 35 gallons per hour (GPH) Inlet and outlet size is 5/16 inch .