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  1. #1

    Default 5.3 fuel pressure?

    i have an 03 silverado with the 5.3 engine. whenever i kick it down the check engine light will come on. it says that all 4 02 sensors have low voltage. well i checked the fuel pressure and i have 45 while idling and i'll get around 55 when i kick it down going down the road. is the fuel pressure the problem? what is it suppose to have at idle with the regulator hooked up?

  2. #2


    the Owners Manuel should have your answer

    1995 Chevy Silverado
    Fully loaded!!!
    4Wheel Drive
    5.7 Liter
    Best Engine In The World!!!!!
    Once i had a nearly dead battery and was only able to get 1 slow crank per attempt, Once to the fifth crank she fired up! (True Story)
    Do you have a Tahoe,Yukon or a suburban? Join My Group

  3. #3


    wow i'm so glad that everyone is so willing to help out. well i finally found out what the pressure is suppose to be and it is fine. the vacuum has me concerned though. i only have 17" at idle. i would think it should be higher than that but i can't find anything stating what it should be.

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