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Our '92 H.O. 4.0L requires a fuel pump that can deliver at least 39psi to prevent fuel starvation. The factory fuel pressure regulator will keep the pressure to the injectors at around 31psi. To make our life simple, we called Hesco for its Rear Mount Fuel Pump/Filter kit, PN HESRFK1, which comes complete with hose, clamps, filter, and a high-output fuel pump