For all Holley MPI / TBI / Terminator EFI systems up to 600 HP

This kit is designed to allow the use for all Holley MPI / TBI / Terminator EFI systems on vehicles equipped with dual fuel tanks. The fuel injection systems require a fuel return line. In dual tank applications, the fuel must be returned to the tank from which it was drawn. Originally designed for all TBI 4 bbl Pro-Jection and 950 MPFI/4 bbl TBI systems.