The Holley Sniper EFI 12-309 is an OE-style, returnless in-tank fuel pump module designed specifically for 1955–1957 Chevrolet Coupes and Sedans (Tri-Five Chevy 150, 210, and Bel Air) undergoing EFI or LS swaps.

It acts as a direct replacement for your factory fuel pick-up and sending unit, allowing you to run electronic fuel injection without buying an expensive custom fuel tank.