The 4.0L engine rests in place of the four. Using Mopar's EFI conversion provided the intake/induction system, a full engine wiring harness, crankshaft pulley, and sensor pickup. Most components are '94-'95 YJ Wrangler pieces with the addition of a later single-rail MPI upgrade. On this YJ, the '87 fuel tank and pump assembly were upgraded to '91-'95 components. Specify 15- or 20-gallon tank depth for the pump and sender.