No, GM says 9 - 13 PSI while the injectors are rated at 13PSI except ones from a 94-95 454 which are rated at 28-30 PSI.also these truck are set up to run 9 to 12 psi fuel pressure.,,
Guilty that was me on my 5.7LAt least one member here has run 28 psi on his TBI, and has posted the photos of his fuel pressure gauge as proof.
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The ECM/PCM doesn't control pressure, the spring inside the throttle body does. 12 PSI is acceptable but I'd prefer closer to 14. With an AFPR (Adjustable Fuel Pressure Regulator) and various springs, you can dial it in to whatever pressure works best for you. I have an ACDECLO EP381 fuel pump from a 96 Vortec engine which is rated @155 L/Hr @60 PSI. Currently I'm running @ 20 PSI with an 18LB spring. YMMVI put a 17 psi pump into my suburban, and it only reads 12 psi. is there any way the computer could be controlling the psi of the pump?