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Without specific model years, I'll answer this for TBI and Vortec engines. The TBI engine has a max pressure of 13 lbs. The engine runs like crap if it drops below 10. The Vortec runs at 65lbs and starts to stumble if it gets much below 60. 55 seems to be the edge before you have starting issues.
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∙ 12y ago
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What does a fuel pressure regulator do on a Chevy truck?
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Where is the fuel pressure regulator located on a 1998 Chevy van
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