Gravity Fed type pump with simple two-wire design. Works on 12 Volt negative ground systems only. Includes fittings and mounting hardware along with easy to follow DIY instructions. Pumps require approximately one amp average draw at maximum delivery. Part No. 12S Specs: 4-7 PSI, 35 GPH. Universal design for most domestic 4, 6, & 8 cylinder carburetor applications. Makes an excellent fuel transfer pump. Not for Diesel applications!!