FDM & Fuel Pressure
For the 5.0L, 5.8L and 7.5L EFI engines, the in-tank mounted high pressure fuel pump is capable of supplying 105 liters (27.7 gallons) of fuel per hour at a working pressure of 270.0 kPa (39 psi). For the 4.9L EFI engine, the pump can supply 90 liters (23.7 gallons) per hour at 380 kPa (55 psi). The pump has an internal pressure relief valve to provide overpressure protection in the event the fuel flow becomes restricted. Overpressure is restricted to 850 kPa (123 psi).
The 4.9L will run fine with the same pressure as the V8s.
Test pressure at the fuel rail with a gauge.
The DLC pinout at the bottom of this diagram DOES NOT APPLY TO '96 trucks since they're OBD-II. The '87-95 DLC is located under the L hood hinge. For more info, see this:
See this FSA:
...& this TSB:
