Thanks for using JA. You need Between 60 and 65 PSI to start and between 55 to 60 psi to run. The Injectors in this engine require a least this amount to open. The
injectors are poppet nozzle type, even if the injector pulses the poppet nozzle will
not open an spray fuel. I have seen Fuel pumps will 55 psi and the vehicle will not start.
If your lucky with 55 psi you can spray a little carb cleaner in the throttle body and it
will start and might stay running. If this info helps, PLease help me by accepting the
answer and a positve feedback. Thanks brian.