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brian, ASE Certified Technician
Category: Chevy
Satisfied Customers: 20
Experience:  Current GM Tech 14 yrs.ASE Master certified, GM trained & certifie
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Submitted: 9 years ago.
Category: Chevy
Expert:  brian replied 9 years ago.

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.