Note- 1987-90 YJ Wrangler 2.5L fours came with TBI and an electric fuel pump in the tank. Pressure can run higher from the fuel pickup point at the tank through the entire MPI system. If you install a 4.0L engine in any 1987-90 YJ chassis, be certain to upgrade all fuel hoses to high pressure EFI hose and clamps. Normal pressure for a TJ system is from 49.2 +/- 5 PSI, depending upon the model. 1991-95 MPI systems operate at 31-39 PSI. BBD carburetors require only 4-5 PSI fuel pump pressure! The 2.5L TBI normally runs 14-15 PSI. Jeep How-to: Fuel Pressure Needs for Carburetion and Fuel InjectionĬarburetion and TBI run at a much lower fuel pressures than MPI systems.
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